When you let compiler generate code for you, you're not a real programmer... That's what opcode coders was ranting in early 60s about FORTRAN programmers.
Product managers can't produce viable programs ready to be deployed in production (yet). But maybe the will able to do it in the future. We don't know how far or close this future is. But I don't think it's not a bad idea in general.
The assumption behind the discussion is that they will be able to produce viable programs. And if you’re letting the LLM own the code, that’s what your job function will be: product manager.