All of the stories I have seen [1][2] say that the books are banned from the school library system. As far as I am aware, school libraries usually contain a wide range of books, not just whatever is required for the curriculum.
So banning a book from a school library does seem to be a fairly strong suppression of ideas. Libraries have usually been the place where you go to find ideas outside the safe circle of whatever is permitted by your (usually insipid) curriculum.
For example, I am not a fan of Ayn Rand's philosophy, but I am still glad I got to read her books from my school library, so I could make that decision for myself. School libraries curated by legislators with an agenda seem like a Really Bad Idea.
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[1] This would be within limits, I guess, but still weird. Wouldn't you just use a different curriculum?
[2] https://www.npr.org/2021/10/28/1050013664/texas-lawmaker-mat...
[3] https://www.kmuw.org/education/2021-11-09/goddard-school-dis...