> “The URL is the app” makes literally no sense without additional context?

Yes exactly - it's one of those sentences that only makes sense to people who already know what it was intended to mean, because they know how it's intended to be parsed without having to puzzle over it. For the rest of us, it's pretty meaningless.

Regarding the LLMism, I didn't click on this submission when I saw it on HN last night, because I'm sick of seeing "The X is the Y", and an LLMish title tends to imply yet another piece of vibecoded slop.