In PRs at work (software engineering) we distinguish between drafting, editing, review, and straight generation.
In creative writing I think it's less about the tool(s) and more about the investment. Reading takes time and attention. If an author offloads the actual composition (the deliberate thought, structure, and prose) to an LLM then they've reduced their effort to as close to zero as they can while still asking for the reader's full attention.
There is nothing unreasonable about identifying this as a bullshit proposition.
Suppose you are an author and you have some plot hole you're trying to work through. You say to llm, I'm thinking maybe we can have this event X happen to explain why some character needs Y. Can you research X more and tell me if this a plausible way to handle this in the story? And the llm says, that almost works but you didn't consider this, so it needs addendum Z. Then who composed the structure?