Genocide by germs? Doubt China would do that. Then Europeans can get away with killing one third of the world population, now China is ostracized for locking up one tax evading celebrity. Time has changed.
Joking aside, this kind of internment is wrong and counter productive. You only made the people angrier and more susceptible to extremist Islam.
Xi is cracking down hard and taking the whole country back to Maoist time. He is the absolute worst leader after Mao and whacking the excellent foundation laid down by the great Deng. As an ethnic Chinese it really makes me sad.
There were several, at least one was faked. And the Honduran girl in the pink jacket who appeared on the cover of Time and elsewhere was never separated from her parents. The whole story was fake - as you point out, instituted under Obama, not Trump. A 9th circuit decision in 2015 triggered it.