At what point do you draw the line? That's an honest question, don't think it's being provocative.
If I write an adventure and ask the AI to correct the mistakes, that's one thing. But what if I just determine the main elements of the plot (for the sake of the discussion, let's assume that my idea is world-shakingly original and not a regurgitation of other plots I might have read in fiction) and ask the AI to develop it by adding, say, elements not central to the idea of the adventure to make it more flavourful, for example by writing the "boxed text"? And what if I write it entirely but asks the AI to translate it to English? Or, in the other way round, if I ask an LLM for a plotline and events and I manually do all the description, monster design and balancing?
Which would you consider "enhanced", which would you consider "AI writing" instead of enhancing?