First - I don't think there is anything comparable to what is going on in China right now. The scale of it - 100 000's to millions - and arbitrary detention based on ethnicity.
There are some 'dark spots' in the world where this happens, but there, it's chaos: Syria, Congo, Somalia.
The reason we don't hear about it from China is exactly the basis of the article: China has everyone in fear of them.
China speaks with one voice, the West with thousands: political leaders, CEO's, NGOs, deans of big schools - in the West nobody really has that much power - and China is hyper aggressive in pursuing their power everywhere, and in everything.
CEO's will never hint a word, they don't need to be told to shut up because they want money.
Politicians, sadly are spooked, mostly for economic reasons as well. Governments are very afraid to speak out due to fear or the response. Germany sells a lot of high end gear to China.
Airlines that use the actual name of Taiwan for example are threatened with not being able to fly in China.
The head of the student union at Ryserson in Toronto is Tibetan, and this drew mass outrage from the Chines 'expat' community, it was fierce and organized from back home.
Consider that 'Tibet' used to be a huge thing in Hollywood/Cali 20 years ago, now magically everyone has just 'shut up' about it. If any political group or state even mentions the Dalai Lama, China screams. So we haven't heard about him in a while.
Almost everyone is afraid to speak out, so it only happens behind closed doors.
Trump, oddly, is one of the few people with both the power and wherewithal to say things but I don't think he cares: if negotiations are going bad with China he'll scream murder, if negotiations are going well, he'll talk about China as such a great partner in peace etc..
The issue of the concentration camps in China is met with strong force and intimidation the world over.
And sadly, it's pretty easy not to care.