The simpler explanation is probably that the business climate is super risky if you're the foreign partner in any sort of JV with China, and they thought they could work through it through ... charisma and sweat and tears. And it turns out that in fact it is hard even if you're some techy VC or w/e.
I think few question what the gov't is doing, but the question is more whether YC in particular was affected by actions in the past year that caused them to reverse course.
Don't you see that this mentality is exactly the problem? Some of these comments are really surprising.
However, despite realizing this problem, it is not clear what to do about it. Clearly, YC did not choose to become leaders on the issue.
Did you read one prior to Summer 2018? Because when YC decided to go into China, there were people in internment camps then too. This stuff didn't start last year: