I mean, the professor is a 79 year old academic who probably had no prior experience with these online debate bro types before this.
In addition to what others have mentioned, I think if you ask for sources they’re basing their opinions on and point out objective problems with them and associate them with the US media’s atrocity propaganda track record, I don’t really see how it can be seen as anything other than being about media literacy rather than holocaust denial.
Some sources that I think should cover most of the problematic narratives surrounding the issue copied from my response in this thread https://hexbear.net/post/39756
Debunking stuff/illustrating the widespread problematic reporting surrounding this issue:
What is (most likely) actually going on:
Saw this episode when I was relatively new to anime and even now after having gone through hundreds of more titles, nothing has really come close to reaching the same level of highs for me.