I’m unfamiliar with this issue. From the article it sounds like he wanted to make this class an “elective”. Does that mean it is currently “mandatory” ? If so, how on earth did it get to be a required course in the first place ??
Tucson has long been radically leftist Democrat. So in their schools they set up this program, officially assigned to a credentialed teacher, but taught by non-credentialed racist extremists from La Raza (’The Race’), and the Aztlan movement, which wants to either return the US southwest to Mexico, or create a new, Hispanic ruled country from it.
The classes taught are leftist Mexican history and culture, with a strong anti-American and antisemitic element to them. America is portrayed as racist against Mexicans, and Mexicans and Mexican-Americans as second class citizens used as slaves. But it also teaches secession, and to prepare for violent revolt against the US government.
Of late, these classes were both mandatory, and have become so controversial that teachers are refusing to be responsible for them. The State legislature has passed a bill outlawing them as racist, and threatened to cut off any State funding for them.
If you want a taste of what the Aztlan kooks are like, here is their website, oddly enough in English. It speaks for itself.