The point is that the teacher is non binary and forced to choose an honorific. They wanted to use a neologism because there isn’t an established term and they were fired because of bigotry. It doesn’t really matter if the term makes sense to you or anyone else, it was their choice.
Your comments reek of the same smug shittiness of people who throw a fit about they\them pronouns not being “grammatically correct” when singular they has been in use for ages.
Non binary people exist, and if they are required by their job to use a formal title, they should have one that recognizes who they are.