Sadly, this is probably just face-saving optics from the education board.

They have direct evidence that such things go on in their classrooms. They must be aware of the spate of parents railing against school boards for their pushing of an ideology. There must be clear rules against this thing but will they conduct a voluntary audit?

Do you think they don't know that the revolutionary sentiments being taught and the rainbow nonsense are part and parcel of the same movement?

Critical Theory has many guises, it's not just Critical Race Theory. There's Queer Theory, Critical Gender Theory, Critical Feminist Thoery, Critical Pedagogy (which is precisely what this teacher was enacting)

In fact, I would recommend reading the highly influential, highly important Paolo Freire book Pedagogy of the Oppressed if you want to understand what this guy was up to and what his entire mindset involves. It's only about 94 pages long (excluding introduction): https://ia600204.us.archive.org/24/items/PedagogyOfTheOppressed-English-PauloFriere/oppressed.pdf

If you don't want to, may I recommend at least doing a quick word search for the word 'revolution'? It, and it's derivatives, appear an inordinately high amount for such few pages. Also, do one for 'radical'. Those simple searches will give you some idea as to what the book is advocating teachers do to their students.

While you're at it, you may as well search 'Marx' and 'Lenin'. There's a mention of Mao in the intro.

Bear in mind that this is still one of the most widely read books within the social sciences and it was written in the late 60s.

The chances that the people who fired this guy haven't read this book and don't know precisely what's going on here I would imagine are pretty slim.