Probably because that book is a psycho book that claims someone's gender isn't just a matter of personal identity.
A book that is meant to scare middle-aged white women about transgender people? As I've explained in the article we know what becomes of this and we have seen it before.

Imagine walking into a library and seeing a book that said " all people named Jack are infecting our children," you would probably be thinking " well, my name is Jack and I haven't even talked to a child in years."
It's a lie, a generalization. Anything beyond what being labeled transgender requires is not predictable on a case-by-case basis. Furthermore, to generalize a population and define a narrative for them without a clear understanding of them is to come to conclusions without facts or reasoning. Not pragmatic or logical, and driven solely by hatred and bigotry.

So sad.

Who do you even think got the book banned? LGBTQIA+? Is that your boogy man? Half of the gay people don't even like transgender people man, so I don't even know what you're talking about. There's no secret cabal or whatever, you're just in a manufactured panic over some stuff you saw on FOX news that's verifiably false.
Maybe they don't want to publish the book for the same reason they wouldn't want to publish a book against say, Jews or Muslims or black people. Prejudice has fallen out of favor, and I promise you prejudice won't win. As long as liars like you are around to spread lies about a population that cannot defend itself, I will be here to expose how uninformed you really are.

Just do some research. Shouldn't take much more than 10 minutes.