> There's never been any hint from either the US or China that those agents were doing anything other than passive intelligence collection, as opposed to actively interfering in domestic Chinese politics. And in any event, the scope of historical CIA operations has always been overblown. In every case I'm aware of, the CIA leveraged a tipping point already well underway to nudge things one way or another.

Beyond being self-contradictory (CIA is passive but also they interfere on key issues) this is just false. The West has spent a lot of (covert) resources undermining China in the past decade in Hong Kong, Xinjiang, Taiwan, trade and tech wars, COVID, and so on. All attempts which have failed dramatically, perhaps partly due to the lack of IC penetration into society and government.