It's a cultural genocide
That's the western claim, but Xinjiang is a special province of China called "autonomous region", with more powers to local politics than most others. Uyghur people can study Uyghur language at school (unlike for exmaple Occitanian people in France) and their culture is preserved. You wanna see a cultural genocide in real time? Look up the population of Occitanian speakers over the past 100 years and the French policy towards Occitanian.