I feel for the teacher if they don’t have a continuing contract, yet. You’re completely dependent on staying in the good graces of your principal to have a job for the next year, and you will only be recommended for a continuing contract with the support of a principal.

But if the teacher had a continuing contract, then they probably should have told the principal to censor the student’s work themselves if they wanted it done. Or that you want the instructions to do so in writing.