Meh, trouble is not laws it is selective enforcement. All this will do is prevent people mounting a rhetorical defence of normality, or presenting a critique of BLM and other leftist trojans.

If a teacher does promote BLM does anyone think they will be censured? If a teacher does promote anti-marxism does anyone think they will be censured?

You have your answer. They always cloak the law in what you want, but when the cloak is lifted, as always, there is a vampire there to bleed you dry and destroy what you love. Laws and rules like this a nothing more than sleeping pills.