How did this page ended up on HN? It seems quite irrelevant.
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic., https://news.ycombinator.com/newsguidelines.html
The first highlight is the good, general rule, the second highlight the one that applies to the submission in question, in my opinion.
- Per the guide-lines : "Off-Topic: Most stories about politics, or crime, or sports"
- Per usage
-- Bill Walsh
"For years, a subculture of teenage hobbyhorse enthusiasts flourished under the radar."
That seems to apply here.