What their chromosomes are or are not is 100% irrelevant to informational content of the book.

I don't know. I am not sure she knows. Seriously how many people actually get their chromosomes checked?

If you are asking if she is trans then yes she is. If you want a shorter article as sample of her work try https://juliaserano.medium.com/transgender-people-and-biological-sex-myths-c2a9bcdb4f4a