The article you cited states unequivocally that the CPC has committed crimes against humanity in Xinjiang. Further:

> There is little dispute within the U.S. government that China’s treatment of the Uighur population has been horrific and criminal: More than 1 million Uighurs have been detained in reeducation camps, and many have reportedly been subjected to forced labor and sterilization. China has committed numerous crimes listed in the convention as acts of genocide, including the prevention of births and infliction of bodily or mental harm on members of a group and the compulsory separation of children from their communities, according to human rights groups.

Crimes against humanity are different han ethnic cleansing which is different from the UN notes in Genocides

Please avoid intermingling all the terms, they are very specific for a reason, and the reason being to avoid US, Canada,, Colombia, Brasil and many others to also fall within the label of being genociding or ethnicly cleansing their own people