HN mods have likely flagged it as flamewar, or non relevant, or both, effectively contributing to the soft censorship on the topic.
Content platforms have many challenges ahead of them.
IIRC, HN has a couple of algorithms to automatically detect "flamewars," and I wouldn't be surprised if this post tripped one, since much of the discussion is flamewar-ish.
I've been on forums where the moderators would remove "derailing" comments/threads, and I think this is a topic that probably needs that kind of moderation, unfortunately.
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.