The imgur link is quatsch.
One, the "Jews" who served in the Wehrmacht were so-called Mischlinge, individuals with Jewish ancestry such as parents or grandparents. This diagram for the Nuremberg Laws shows the complex permutations for Mischling status. A good many Mischlinge did not consider themselves Jews and their post-Nuremberg racial status came as a surprise to them. Added to this, the dictatorship never really had a consistent vision of Mischlinge in the new order. Military service for Mischlinge was complex and the restrictions for those of mixed ancestry were inconsistent. While the immediate manpower needs of 1939 led to more open recruitment of Mischlinge, but the years of victory led to new restrictions. Of course, the Wehrmacht was a power bloc within the state, so some individuals of mixed ancestry like Erhard Milch were able to evade these systems because of their social and political capital within the military. Mischlinge without these connections were far more vulnerable to the whims of the state's racial policies.
Nonetheless, while the Third Reich's policy towards Mischlinge was confused and inconsistent, the same could not be said about its policies towards what it defined as full-blooded Jews. Simply put, they could not serve within the German military. This was one of the basic features of German rearmament and while the state hemmed and hawed over Mischlinge in the regular military, it was unequivocally opposed to their presence in elite organizations like the SS.
Second, the idea of "white Jews" is..... stupid.
Not only is this idea anachronistic to a certain extent- "whiteness" as a racialist category was not really all that important to Nazi racial science- it ignores the simple fact that the Nazis did not give a damn about assimilated Jews. The Third Reich's murderous policies did not care if a Jew was a convert, non-practicing, or did not dress in traditional garb. In the eyes of the dictatorship they were still Jews and had to be eliminated from the Nazi imperium. Nazi propaganda did find the stereotypical Ostjuden useful, such as this poster, but it also maintained that assimilation was a greater danger to the health of the racial community than segregation. A clear illustration of this was in the infamous propaganda film Jud Süß in which the eponymous villain starts off as a caftan-clad Ostjuden, but acquires modern dress in his nefarious plot to undermine Württemberg and seduce its women.
So, no, the link is not true.
Yes and no. The second part, about the Jews present in German armed forces in the Third Reich might be possible. But it bears no relevance to the first part about Hitler's views. But to address the claim, we need to make one important statement, namely, that we are speaking here of Hitler's beliefs that were represented only to some extent in the policy of the Third Reich and actions taken by other politicians.
When speaking of Hitler's personal beliefs and agenda, we can assume that the best primary source for this information is 'Mein Kampf' and other materials penned or delivered by Hitler. At no point Adolf Hitler makes any distinction between various group of Jews, even though the division between Palestinian (or, more broadly, North-African), Sephardic and Ashkenazi Jews was well known both inside and sometimes outside Jewish communities, so it stands to reason that if Hitler took any interest in such question, he would most like address it. But in his book he treats Jews uniformly, with no regard to their philogenetic traits. All Jews are treated uniformly by him. Let's look at two quotes introducing the subject of Jews in Germany ('Main Kampf', part I, chapter 2; as I don't have English version available at the moment, this is my personal translation from the German original).
> 'There were few Jews in Linz. Over the centuries, they became very similar to other Europeans and were did not differ from them visually. I was treating them like other Germans back then. For me, the only visible difference was their religion'.
> 'I was strolling about in Vienna one day, when I noticed a strange being with black sidelocks, clad in black coat. At first moment, I started to wonder, whether this is a Jew, because Jews in Linz were looking completely different. I began to observe this man discreetly and the longer I was looking upon his facial features, the more doubts I had whether he is indeed a German'.
So, it is obvious that for Hitler in 1920's Jews were not different visually from Germans, what is corroborated by visual evidence from that era showing that German and Polish Ashkenazi Jews were generally much more similar to German and Poles, sometimes to the point when they were indistinguishable. The second quote above shows that the only traits worth mentioning in an unusual figure were sidelocks and uncommon garb, meaning that the man Hitler describes was most like a Haredi Jew, quite possibly a Hasid. Furthermore, his facial features were, according to Hitler, 'very similar to that of a regular German' - there is no mention of a skin tone or significantly different visual traits. Given that this was Vienna, this man could differ from an average German on account of his Polish or Italian descent (what is quite probable, as the part of Poland with the most significant Jewish minority belonged to Austro-Hungary prior to restitution of the Polish state in 1918).
When it comes to Jews in German Army, /u/kieslowskifan explained how Nazi officials interpreted 'racial purity' and that people that would be considered today 'of Jewish origin' and who could even identified themselves as Jews could have been considered 'of German blood'. Furthermore, many people, especially those not really observant, were hiding their Jewish heritage long before Nazis came to power because of anti-semitic policies and sentiments in Germany. Such notion only intensified after 1932, when the anti-semitic policies resurged with a new power. Last but not least, Wehrmacht was not that much considered with the recruit's genetic history, especially after the first major defeats. This meant that someone who was able to hide one's Jewish ancestry at that point, generally was not bothered anymore. There is evidence evidence of Jews who actually joined the army considering it a way to hide from persecutions (it is also worth noting that even though helping Jews was a capital offense in military, much like in occupied Central and Eastern Europe, there is evidence of only three cases of such execution in Wehrmacht). Now, the claim of 30.000 Jews (or, to be precise people of Jewish descent) in German armed forces is pretty low, as with almost 18 million personnel that was enlisted at any point between 1939 and 1945 we get 0.16%, pretty much a negligible amount.
No, this is definitely not true. Nazi ideology did not see differences between Jews, and did not see any Jews as "white" or Aryan. Anyone with even one Jewish grandparent, whether they were practicing or not, whether they were considered Jewish by Jewish law or not were the same, and all were meant to be murdered. The Nazis were more deadly towards Eastern European Jews, but this likely has more to do with public/ international opinion, the fewer number of Jews in Western Europe, and the want to steal all wealth of Western European Jews before killing them. It did not have to do with seeing some Jews as "whiter" than others.
