It doesn't seem like it's directly book ban, and more of a selection of books that are deemed inappropriate for kids according to the school which Pen disagrees with.

Popular banned books like Lolita, mein kampf are not here, but they are also not in U.S. schools. There are also no books listed here that schools definitely (for good reason) do not have, like COVID denialism, cult books, etc.

I'm happy to be proven wrong in the comments though, this is just from my cursory look at how they define it.