I’m not actively following the saga, but that seems like a gross mischaracterisation in all directions. I haven’t seen anyone seriously call her a Nazi¹ and her comments aren’t harmless either.

¹ Though I wouldn’t be surprised if it has happened. But then again that’s not saying much on the internet. Doing a cursory search, I found a post² on her own website where she complains someone said she has “uphold [Nazi] ideology around gender”. “Nazi” is between brackets, presumably meaning it’s a substitute for another word, and even then that’s not calling her one.

² https://www.jkrowling.com/opinions/statement-from-j-k-rowlin...