A most interesting experiment indeed. As AI becomes better at mimicking human writing and story telling, it could become very difficult to identify whether a piece of writing is AI generated. I know that for drafting work documents, policy writing and speeches I need to give very clear instructions, upload tons of my own writing and give guidance on style, grammar, vocabulary suitable for the audience and to keep description and one liners to a minimum. In the end, it can take quite a long time to get your product just as you want it.