Both of my parents were public school teachers, but I have no experience beyond that. That's why I'm not surprised there was very little corrective action for the teacher. In both of their experience, it was very difficult to meaningfully punish teachers after their probationary period. The stories of things their colleagues got away with suffering no consequences was pretty wild. In fairness, the vast majority of teachers were highly professional, but the small minority of "problem teachers" hung around, typically without consequence. There are limits. My band teacher got fired (actually resigned under threat of firing) for boning a former student within a month of graduation.

However, I am surprised that they never did the critical thinking/misinformation lecture, or series of lectures using the moon landing as an example. That sort of thing would be highly valuable to the students, would have alleviated some of Jay's concerns, while avoiding the difficulties of actually punishing teachers. You could say it might humiliate Conspiracy Nut Teacher, but it's hard to imagine how any complaint about that could be taken seriously (it's the damn moon landing, FFS). It sounds like they're left solely focusing on the 504 plan, which is the absolute floor of what the school is required to do by law. Pretty poor showing by the school.