You make some good points but I am not completely convinced you're arguing in good faith. Do you have any cases of "pro CCP" content reaching the front page here? Because the opposite happens multiple times a day. Context matters. Pointing out blatant hypocrisy has nothing to do with supporting whatever the current boogie man is.
I am not saying pro-CCP content is reaching the front page. All I am saying is pro China / anti-west comments are common in threads about China. In this very thread there are many comments basically saying the US and the rest of the western countries are no different than the CCP. This thread has nothing to do with the west other than Valve being a western company. I wouldn't mind a conversation about the companies in the west doing business in China or western countries restricting Chinese companies, but that is often times not what we are seeing.
Most of the posters on HN live in the west and likely consider the government of the country they live in to be better (morally) to the government of China. Seeing posts that are pro-western is to be expected for that reason. Like I said above, I am not saying there is a problem with pro CCP posts making the front page. If China does something good, I would have no issues with an article about it making the front page.
I would also note that posts that are critical of the west (especially US) do make it to the front page. In those posts at worst we see an acceptance that it happened and maybe some arguments that we should do more to try to fix the wrongs done. When we have a China post we see deflection and sometimes denial of human rights violations. When there was a post about the Uyghurs there were multiple commenters saying we can't trust the western intelligence agencies and news organizations. When is the last time you saw comments like that when it was against a western country?