Ok, fine. Food for thought:
You'd probably like to ban the topic entirely, but it'd be weird to have one banned topic and you've said that doesn't work, so that's out.
So what's left, being even-handed, I guess. Except it's a 10-1 ratio, so being even-handed, ban people from both sides leaves you with a 9-0 ratio.. congrats? Even if you're really, really, really trying to be even-handed with regards to content, most people would bias towards handing out 50-50 to feel fair, while 10-1 (or whatever ratio) is actually statistically fair. But that would feel quite biased if you did it! Practically taking a side! So we get a phenomenon where a bad Chinese-adjacent comment (or even a polite one) is super likely to be moderated, but you can't possibly moderate all of the really bad anti-China comments in this thread, there's too many, they rule the day and they establish truth for passersby.
Tech is one of the few industries with a large Chinese minority during this time of rising tension. It would vastly improve the intellectual tone of the site if we had more of them explaining their viewpoint and less of people telling them they're brainwashed.
Failing that, I think the actual real-world answer is to pro-actively push down the repetitive anti-China stories that hit the front page multiple times a week, and then just deny it if anyone asks. They're not intellectually interesting, they're hostile to a significant tech minority, and you don't like the flamewar. Why keep them?