Earlier quoted context omitted.
To be fair on the last part, shadow ban can be an extremely efficient moderation tool, though for people caught up as false positive collateral damage it can really suck. This is true even in hackernews I would assume, certainly it is any other place I've moderated before.
When an account is established, we usually tell people we're banning them and why. Shadowbanning on HN is mostly for new accounts that show signs of either spamming or trolling. You're right, though, that there are still false positives in such cases, and those suck.
You routinely shadowban people you disagree with. Or post-limit them. You don't get to act innocent here when I guarantee you're just as guilty of these dark patterns as every other site.