It goes far enough that your concern is valid. Since HN is not exactly mainstream and many Chinese people are posting similar kinds of videos, you're probably okay in this case. However, if you want to make honest comments about China online and still want to travel there, I highly recommend that you post anonymously.

China is an autocratic dictatorship so the rules can and do change at any time, retroactively and arbitrarily.

That said you aren't going to be blacklisted for a single comment on HN. That sounds like the kind of thing the US would do.