Let me address that in two parts.
The colonial boarding schools started in 1979 and have been running until now, but the situation is getting worse. On top of that, under the Xi Jinping regime, they've produced a new policy of having the boarding preschool education system.
I deeply engaged with the curriculum issue and the contents of the textbooks over the 10 years when I was teaching at my former university. For example, I produced two Tibetan knowledge-based textbooks. I also did some of the training conferences and, one year after Xi, China stopped that.