Hmm, interesting. From what I've seen of it, it doesn't do this at all. But it does, in my view correctly, admit that women's sex-based rights and protections are built around their sex-based oppression.
I'm a man. I don't like the implication that women need to be protected from me and people like me. But it's not misandric. Sadly it's just true. I don't pose any threat to women. But I completely accept that and understand why I'm not welcome in some spaces.
If we're to have a conversation about why female-only spaces exist at all, can we do that without first acknowledging that sex-based oppression enormously disproportionately affects women and girls? And is enormously disproportionately perpetrated by men?
Also, why do you say that Rowling is transphobic?