Technically, for something to be “authentic,” it must come from the self (the autos). More baffling here is the assumption that to “supply the ideas” is a form of authorship. This (AI-manufactured) post is describing humanizing AI text, not authoring anything of your own.
Suppose you spend three hours working with AI on an essay. You supply the ideas, reject bad arguments, restructure it, rewrite passages, check facts, argue with me about wording, and eventually arrive at something that expresses exactly what you think.
Why is it not authentic?