The documentary makes a lot of claims that completely contradict the commonly taught WWII history, painting the Allied leaders as criminals and stating that the amount of Jews killed was only a fraction of the usually stated 6 million. Is this accurate? What do you think of the sources provided in the documentary? Obviously there is bias but this would truly change all of recent history if it is correct. Thank you for your time!
stating that the amount of Jews killed was only a fraction of the usually stated 6 million.
If a documentary, especially by someone with no academic credentials states something like this it's pretty safe to assume it falls under the holocaust denial cottage industry and has little to no credibility.
The holocaust is one of the most well documented atrocities in history, largely because the Nazis themselves were obsessed with bureaucracy and keeping records. Numerous eye witnesses, including high officials, were interviewed after the war and testified to the scale and extent of the atrocities.
The ultimate reason why a small number continue to keep up the denial is because 1) the mere existence of the holocaust points to far right politics (at least in Europe and to a certain extent the Muslim world) as illegitimate, and denying the holocaust is a convenient answer 2) an appeal to second option bias: it usually appeals to the idea that mainstream scholarship is corrupted and that the speaker is an island of truth and 3) A kind of emotional appeal among political fringes (both far left and far right) to the idea that US and Britain are basically evil and whoever fought against them can't have being too bad.
This thread addresses some pretty common denial points:
https://www.reddit.com/r/AskHistorians/comments/1n3vwo/do_holocaust_deniers_have_any_valid_points/
Obviously there is bias but this would truly change all of recent history if it is correct.
As a general rule, things that claim to "change all recent history" are usually false. Sure, new things about history are discovered not infrequently, but things that actually change perspective about a huge chunk of history really massively are quite rare. It's much more common for something to be crackpottery than for it to be legitimately earth-shattering. And if it were earth-shattering it would probably not come out in the form of a documentary.
Anyway, I've not been bothered to actually watch it, because I know it to be Nazi drivel, and I have better things to do. Everything I've ever read about it indicates that it's a movie interested in antisemitic garbage of various sorts, and whitewashes the Nazis. Basically, not something to be bothered with. Minimizing the number of Jews killed is standard Holocaust denial stuff, which is of no interest to serious historians (except those who study genocide denial and the like) and is not supported in any way by facts.