It’s pretty reasonable to infer from the circumstances that such an attempt would immediately get the teacher into big trouble. It would certainly have a chilling effect at the very least.
In any event, can we agree that it's misleading to describe what happened simply as "banning" without further qualification? As an example of a more accurate description, I would point to Reason's article on the subject [1]:
> Tennessee School Board Pulls Maus From Eighth-Grade Curriculum
> A grim sign of the bureaucratic mentality controlling public education
[1] https://reason.com/2022/01/27/tennessee-school-board-pulls-m...