If you point an LLM at an idea, you'll get a "lossy JPEG" version of that idea.

It requires discernment, taste, on the part of the user to be able to point the LLM at the weird parts that look wrong.

Even with that, the LLM can only fix most of, not all of, those rough edges.

LLMs will generate. Taste continues to dictate what to keep/discard. (Note that taste can get you to good, but good won’t get you to money on its own)

It's still true for now. AI can't yet make a game with complex mechanics feel good to a human, although it can speed up a lot of the implementation.

This is fantasy and if it was true the idea would be public when the product was released.

There's no moat in an idea either so I guess it's down to marketing budget.