Edit: I'm not implying it's a good thing.
It's a joke that did not drop. Given the audience is trying to read text. And he's making it annoying to read text.
It's like a stand-up comedian telling a joke, in a wild accent; where the audience cannot discern what he's saying.
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[1] https://web.archive.org/web/20251207071946/https://tonsky.me...
I'd imagine he thought the blog was mostly going to be about UI. "Haha, a blog talking about UI, with bad UI. Isn't that funny!"
Like there's no way the flashlight UI was done for usability purposes. It has to be a joke.