I made a new language.
God says... frivolity's inestimably blooded girder wisp Polanski's Playboy's Becker's Wolfgang's boobing nascent Katina tarts Mohawks safeguard's trampoline's soliloquize proboscides assisting unbosomed expends tasted rejoinders chitchat's jute's musically secedes trawl's pounding Watts principle Dnieper
He gets this treatment because he occasionally posts something technically worthwhile, and because his outbursts are likely a result of mental illness. Even so, very, very little of what he posts is visible to most people because even a lot of otherwise good comments have offensive parts tacked on.
(In this case, the last bit is a reasonably un-offensive output from his random text generator, it would seem).
HN semi-recently introduced a new feature called vouching. When you see a dead comment you feel is worthwhile and constructive, you can click on the comment's timestamp, then click "vouch." This will cause the comment to become visible to everyone. That's what happened here.
The "vouch" link will only appear for users with a certain amount of karma, and abusing this privilege can cause your vouching ability to be removed. It's one of the more impressive features of HN, since it gives some measure of moderation control to the community. Tangent: It's also the only way that people who create new HN accounts via Tor are able to post comments, because comments posted via Tor from new accounts are autokilled. I've only seen this matter once or twice, but the fact that vouching worked for those few cases made the HN experience feel quite special.
If you go to https://news.ycombinator.com/threads?id=TempleOS and haven't enabled your "showdead" option, you'll only see Terry's vouched comments. This may have been a source of confusion, since it could have given you the impression the account wasn't banned.
The HN mods are quite responsive via email. In general, if you have a question like the one you originally posed, you may want to try sending a short, clear email to hn@ycombinator.com.