The most famous forms of Holocaust denial and revisionism tend to focus on Jews, casting doubt, for example, on how many were exterminated in the camps. But denying the impact the Nazis had on the other groups they targeted, including queer and trans people, disabled people and Romani people, is still Holocaust denial. Maybe someone should tell J.K. Rowling.
The big problem about discussing conservatives / Conservatives here is that this board seems quite US-focused. The British Conservative Party (the current party of UK government) pretty much came in to existence back in the day to “conserve” things and put a check on “progressive / liberal” policies. Conservative means something different whether your context is American-politics or whether it’s politics-politics.