Most people would be unequivocally against slave concentration camps. Do not confuse lack of action with lack of caring.
Effective action may require collective action. But individually, most people care. Yet, collectively, they cannot seem to do anything meaningful. You are making a statement that is the definition of an ecological fallacy [0]
The article you pointed out is hardly balanced. The access of journalists is heavily restricted. Naturally, any information that comes out from a standard news outlet with government sanctioned offices like Associated Press will sound like government propaganda. CCP will not let AP have access to any information that counters the narrative of the propaganda.
For a different take on things, and an outlet that does journalism differently without official representation with CCP, have a look at this piece from VICE [1].