It's a joke for this specific topic, that is on the entire website, and has been for almost a month prior[1] to this post being published?
[1] https://web.archive.org/web/20251207071946/https://tonsky.me...
[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.