[fuzzylightbulb]

Always assume the more charitable interpretation. I think the person was just being hyperbolic, and used "70%" to mean "a lot". Pedantic squabbling over the exact number of something that is essentially unknowable is not particularly helpful to anyone except for the human rights abusers.

With that out of the way: I do think that if there were a mechanism in place that was sufficient to hold a huge state such as China accountable, it actually would have a significant impact on worldwide human rights abuses. If China was not able to get around this, what options would smaller tin-pot dictators have other than to reform?

Proving to the world that the rules apply regardless of relative size/importance has significant downstream effects beyond the single entity that is brought down for noncompliance with those rules. Likewise, the visible lack of required accountability for large players undermines faith in the system and encourages smaller players to see what they can get away with.