Basically false, I think? From the first couple of pages of the top-of-all-time HN posts:

* War stories (e.g. "How I cut GTA Online loading times by 70%" https://news.ycombinator.com/item?id=26296339 )

* Anything by ciechanow.ski (e.g. https://news.ycombinator.com/item?id=42443229 )

* Strange bits of personal whimsy (e.g. "I sell onions on the Internet" https://news.ycombinator.com/item?id=19728132 )

* Neat toys (e.g. 2048, https://news.ycombinator.com/item?id=7373566 )