If they are using the History Channel as a source for the first assignment they could use that eminent historian Paula Deen for this one.
I have to say that this is one of the few cases where, if my daughter were given this assignment, I’d be making huge complaints and/or going to the news media about it. No educational value at all, and it actually encourages kids to look at far-right sites, and they’re what, 14 years old? I could see challenging college students by setting them an assignment which had them access far-right sites, but not young teenagers. There are no even halfway credible sources arguing for the Holocaust existing; the assignment is asking for something which is impossible.
What next - does the USA have fifty states? Was the first President George Washington? Is the Pope Catholic? Does a bear… etc. Find credible sources arguing against your position.
The teacher would have to give me a really good explanation for their motives first, but barring some world-changing excuse, I’d then submit an official complaint about their teaching to whoever is in charge, with the aim of them not teaching history again until they learn how to teach.
No, your analogies would have to be “did the Pope really persecute Galileo?” and “did the civil war really happen?” Analogies to your examples would be about why the holocaust happened, not if it did.
If they wanted to do something like this, the assignment should have been something like
“Here are 3 arguments made by David Irving. Please show the flaws in each argument.”
This would teach students how to evaluate and research what they read (very important skills in the internet age) without appearing to give equal weight to wrong ideas.