This post is incredibly downmodded on the front page.
Compared to #1 and #2 ranked posts, which have half the upvotes, but uploaded within the same hour or two, this post is ranked #19.
Maybe many people are "flag"-ing the post so the HN ranking algorithm pushes it lower.
(Edit: For the record, I don't believe the HN mods are doing any downmodding here, and it's probably just due to the ranking algorithm and behavior of the HN audience)
There is an option for mods to slow or accelerate the decay function of the post.
This is a practice that all content platforms use and few know about. Burying content down, or removing from feed (for Facebook/YouTube) is a soft censoring that avoids user and regulatory backlash.
I would like the platforms to be more transparent about the practice. They could display a ‘derank’ or ‘delisted’ label to all users.
Hacker News really shines on technical subjects, of which censorship in Hong-Kong isn't. It is important, just not what this forum is best for.