The most interesting things I've ever come across are old and dead technologies. Better question is why wouldn't this be posted to HN?

In the sense that HackerNews, the non-startup promo part, is neither a "breaking news" site nor a vocational school. It's a social link posting website for things that interest hackers.

Whether the language is "old" or "dead" has absolutely no bearing to whether it's interesting, inspirational, worthy of study, and so on. Not to mention that hackers should know CS history too.

It piqued someone’s curiosity.

It’s a fun and different language. I enjoyed playing with it from the Seven Languages book.

I contributed to it in 2015