Yeah. Lots of busywork where if you had to assign it to a human you would need to find someone with deep technical expertise plus inordinate, unflagging attention to detail. You couldn’t pass it off to a batch of summer interns. It would have needed to be done by an engineer with some real experience. And there is no way in the world you could hire enough to do it, for almost any money.

You've missed the subtlety here.

LLMs don't have attention to detail.

This project had extremely comprehensive, easily verifiable, tests.

So the LLM could be as sloppy as they usually arez they just had to keep redoing their work until the code actually worked.