Earlier quoted context omitted.
LLMs don't average , they learn the distribution , from which you then sample (or the UI does it for you). Because of that, they don't write in a single style that's a blend of many human styles - they can write in any and all of the human styles they saw in training , as well as blend them to create styles entirely "out of distribution". And it's up to your prompt (and sampling parameters) which style will be used.
True, a better choice of words than average would have been: a very likely completion to a starting state/input.
Please write , .
Where = "as if you were a pirate", or "be extremely succinct", or "in the style of drunk Shakespeare", or "in Iambic pentameter", or "in style mimicking the text I'm pasting below", etc.There's no way those "AI detectors" could determine whether the text was written by AI from text itself, as it's trivial to make LLM output have any style imaginable.