I'm pretty sure you can't reliably distinguish LLM text from real person text.
People losing their jobs to ChatGPT don't even call themselves writers, at least not seriously. They produce content, most of it regurgitated the same way ChatGPT does it. If I produced content for online click farms I would worry about so-called AI. I don't think Murakami or Cormac McCarthy have to worry, but James Patterson might get replaced by an LLM (if that didn't happen already -- hard to tell).
In my own profession, some programmers already express fear for their future because Github Copilot and ChatGPT can write code just as good as they can. That should tell them to level up their skills, because if whatever they do can just get automated away by a glorified auto-complete they weren't adding enough value in the first place.
Exaggerated voices might give you variety, but I don't actually want to read a piece on the style of any of those voices. I would, however, be intrigued if it could write like me, or like any of the famous nonfiction writers who I've consciously patterned my style after (Isaac Asimov, Mary Roach, Cecil Adams, Michael Pollan)?