The recent #HolocaustDenial / #HolocaustRevisionism by #JKRowling isn't a new strategy: it is very important to #Nazis and #NaziSympathizers to muddle and distort the actual number and nature of the 20 to 40 million victims. If they can convince people that "this group wasn't actually a victim of our violence", or that "our violence wasn't part of their violence", they can distance themselves from each other on the single issues and divide opposition.
The reality though is that Nazis don't have a single target: they want to kill everyone who doesn't meet whatever criteria they are giving for the in-group at the time, and the list expands with violence-capacity.
Jews showed up at the top of their list in the #Holocaust because rampant #antisemitism made them a high priority and an easy target, but Romani, Slavic, Gay, and Trans people were definitely being targeted, and everyone else would be eventually.