I read the synopsis of the book(thanks for the link). I can see where a book like this wouldn't be appropriate for a 10yo but an entire school system ban seems an overreach.
It would be nice to ensure that as a parent, I was the one introducing topics to my child but having raised her already, I realize that unless I kept her at home her entire childhood, that's a pipe dream. I would have been ok with that book being at her school and if she had read it, she most likely would have talked to me about it as we had many candid conversations on sexuality, relationships and other topics that she came to be aware of via the internet, media or friends.
I disagree but we'll revisit the conversation in a decade as I added the task to my calendar so I'll talk to you in 2034.