Your actual question "Has time altered the way people report the holocaust?" is quite interesting and someone may come along to answer it. I just want to note that this:

all the gas in the camps was never used to kill people, just pests. It said that during the years we've romanticized the war so much that we're not studying facts anymore.

is standard denialist nonsense. The only reason that person is saying "we're not studying the facts" is because they don't like the outcome of the studies. There's no underlying change in reporting that that person is relying on. Perhaps they're getting a warped view because of selection bias and/or confirmation bias (i.e. being "in a bubble" on the internet). The video linked in the comment you refer to is from the "Holocaust Hoax Museum", which supports the idea that the author is getting their information from denialist sources. It's easy to get stuck in a self-reinforcing bubble of sources on the internet and then think "the research has changed".

A relevant link. The Daily telegraph reported on extermination camps in 1942. It cites the original article as well as its reception, which was very low and didn't gain much traction.

http://www.theguardian.com/media/greenslade/2015/jan/27/daily-telegraphs-holocaust-article-in-1942-that-went-unheralded

edit: Generally, in the West today, we very much focus on the Holocaust as athe central crime of the war. But during the war, also due to not knowing enough about it, it was a bythought rather. This changed when the Concentration camps and extermination camps were liberated and the Allies saw the crimes first hand.