Perfectly summarizes the post, which I'd qualify as a rant (the author's main gripe seems to be that it's a galactic algorithm that assumes exact complex multiplication). The theory of computer science literally started with a mathematical model by Alan Turing that has nothing to do with computers (ones that we could physically build, anyway; and even if we brush aside the infinite tape, it's just architecturally completely different from any computers we've ever built for practical purposes).
If you don't like mathematics without direct applicability, you do you, but it's a legitimate mathematical undertaking and cheap way to rant against this AI drop. Do the work and show us if there's a mistake in the argument, missing attribution or whatever actual problems with the paper, but spare us your sour grapes.