I think we all want this to be a technical glitch, but I think that's not the case. This policy was made to appease an authoritarian government, and extending beyond their borders by design.
Not to mention that there's actually a word filter feature for content creators so you'd need to figure out if this is youtube deleting the comments or the channel owner.
I tried this myself on a Joe Rogan podcast, who doesn't speak Chinese and is based in L.A. and my comment was removed with 20 seconds. I very much doubt that he was the cause of the censorship.
I feel unless shown otherwise (and I'm not really keen on spamming random hate speech into youtube comment sections), I'd assume that slurs like that may have been caught in some generic filter.
YouTube can hold potentially inappropriate comments for review in the following languages: Arabic English French German Japanese Korean Portuguese Russian Spanish Turkish Vietnamese Thai Indonesian
Chinese is not one of them.