It is simply a Russell conjugation: librarians curate books; parents and school boards ban books.
Personally, I don't trust librarians or school boards, and I put a lot of work into curating reading material for my own children. Many of the books I value are out-of-print, or unavailable in any public library, whereas almost all these so-called "banned books" are available in most public libraries. So yeah, these lists get a giant eye-roll from me.
So if a librarian goes to a conference and learns, "hey we need to remove these books from the lirbary because they are bigoted/racist/problematic" and they do so, that is not a book ban. But if parents say, "hey this book is not appropriate for our kids, this should not be in a school library", and they raise hell to get it removed, that is a book ban. The whole framing is dumb.