Can you point to one such instance? Because personally I think the articles Zenz writes are much more reasonable than articles other people write with reference to Zenz. Specifically, he thoroughly annotatates factual statements with links to sources (often official data provided by the Chinese government), and when he presents his own interpretation, it is clear that it's just his opinion. I happen to often disagree with his opinions, but never with the facts he's basing them on.