Thanks for the source although I think that’s quite specific. It seems mostly about her being ignorant and doubling down on her war against trans people rather than a blanket denial of the holocaust which the term “holocaust denier” conjures

Your article frames it this way:

While Rowling has not denied the Holocaust itself happened, she is accused of engaging in a form of Holocaust denial for questioning the persecution of trans people under the Nazi regime, a fact which has been well documented

I’m not denying she’s a cunt but I think it’s important to be precise with these sorts of allegations.