I guess all the Harry Potter actors, having been rich and famous since their early teens, and mostly coming from very comfortable backgrounds before that, have zero concept of what it is to be vulnerable (unlike JK herself).
Hence Evanna and Emma Watson can genuinely imagine that women are a privileged group - because they, and everyone they know who is female, is indeed rich and privileged. And that of course includes JK herself, who they know as a billionaire (they never knew her when she was poor and struggling).
Meanwhile, transwomen are a category they read about in articles about black transwomen dying whilst working as prostitutes in Brazil. The fact that in reality, transwomen aren't actually all black Brazilian prostitutes and many are highly paid white male tech workers is not something that Evanna and Emma will understand, because in reality they never go near either category. Rich society women and celebrities, yes, they mix with them daily. Working class or ordinary women (of any colour), no.
They also won't understand what it's like to feel physically threatened because they themselves can afford bodyguards.
It's all a game to them. They are still children - like Harry Potter characters who never grew up.