I’m asking this question because I used to frequently browse RationalWiki, (A Neoliberal Skeptic website that frequently calls ML’s debunkings of Atrocity Propaganda “denialism” and “apologia”, and conflates said debunkings with Holocaust denial), and would like some clarification on this point.
As others have said, it’s simply a matter of truth and evidence.
Good book on the topic - Atrocity Fabrication and its Consequences (pdf link)
https://ia600302.us.archive.org/1/items/abrams-atrocity-fabrications/Abrams_AtrocityFab.pdf