baaaaaaaaaaah
big if true
The historian in me knows a coalition of nations and peoples all contributed in various ways to the defeat of Nazi Germany.
The baiter in me just loves to say that Stalin killed Hitler and ended the Holocaust, while the Brits and Yanks kinda helped.
The PRC has always worked to create a pan-Chinese identity, including all their minority ethnic groups along side the Han majority, but this doesn't mean there's an effort to eliminate local cultures. People are fully capable of leaning Mandarin and enjoying Han-centric media while continuing to speak their local languages (which are legally protected) and maintain their old ways of life.
You can go to Xinjiang today and meet Uyghur people. The fact that they live freely, and that Uyghur culture is still alive and well, is pretty ample evidence that there's not been a genocide.
I think you can have reasonable criticisms of the reeducation program but to call it a genocide just seems factually incorrect.