Good post, though I should point out that HIV entered the human population independently at least twice (HIV-1 and HIV-2), so your counterfactual world missing HIV might not be as likely as one might otherwise think.
(There are also counterfactual worlds where SARS-CoV-1 or MERS-CoV or similar took off as well with an even higher death count.)
It is not uncommon, and I will even say usual, that Nazi sympathisers are at least somewhat subtle about it.
This is not particularly subtle. Here’s their section on the Holocaust: https://nyadagbladet.se/tag/forintelsen/
Here’s an editorial written for Holocaust Remembrance Day. Their central claim is that the way to prevent antisemitism it to stop “lying” about how many Jews were killed. https://nyadagbladet.se/ledare/sa-forebygger-vi-den-verkliga-antisemitismen/
This is very classic Holocaust denialism. I don’t think it’s unreasonable to call a website that actively promotes ethnonationalism and Holocaust denialism “pro-Nazi”, unless you think that the literal words “pro-Nazi” must appear somewhere in order to qualify.