In fact, unless the comment is from someone living in China: understands the politics, it would only be fair to critique the authoritarian aspects of the government they actually know.
The issue is propagandists are typically brainwashed already.
Do you believe only Americans should be allowed to critique the American government?
I'm an American and I don't believe that.
Plenty of people around the world know about the authoritarian aspects of the US way better than the Americans, as they suffer their consequences.