Because it's so thin, anything longer than 12 words becomes a paragraph which "slows" the reader, so there are a lot of punchy short sentences. This style would look silly if it was written on a wider left-aligned blog.
Alternatively, when I see the old-school blogs that fill the entire page-width, I get the instant feeling I'm about to read something opinionated and quixotic.
Sure enough, the last HN article with that style hit it-- let's rescue the web by sending around WASM-blobs to be rendered to a common Wayland-like compositing surface. Thanks again, default CSS!
A lot of catchy one liner hook sentences ("they're literally removing concession stands from NFL stadiums!") that sort of add up to make the author's point.
I'm pretty sure fact checking line by line will make the whole thing less impressive.
Everything has to be distilled down to ~200 char chunks that can be understood on their own as well as within the wider context.
https://john.kozubik.com/pub/IcebergArticle/tip.html
... which is intended to present detailed, long-form treatments of a subject yet, at the same time, provide something interesting and actionable in a brief moment.