I'm confused as to why people would think youtube is bothering to sensor those two characters in oparticular as opposed to something much more likely like spam/bot filtering or channel word filtering. I'd think the Chinese Gov would be much more animated about videos like this: https://www.youtube.com/watch?v=r9AvUuEPgvA
or this: https://www.youtube.com/watch?reload=9&v=S3RzKKfNkTk
or this: https://www.youtube.com/watch?v=Y4TReo_G74A
or any of millions of other videos.
i can find plenty of negative comments directed at the chinese communist party in comments all over youtube.