I read the post slightly differently.

LLM code past a few pages is really unreadable. A workflow of LLM writes code, human reads/checks/corrects is IME very unproductive and frustrating, and you're usually better off writing by hand (YMMV).

If you want to reap some productivity improvements, it can't rely on you reading, grokkong and accepting the LLM code line by line. You just kind of need to suck it in.

So the best you can do is to indeed, constrain it heavily, maybe write the interface, then have the LLM write tests, then have it write the code.

I'm not saying I like the approach, but I agree manually verifying LLM code is very frustrating and unproductive.