I think you dramatically overstate the human contribution, but if it exists, it would be seen by the author sharing their prompts. I can see how that might prove embarrassing, though, if their contribution is minimal, so I can see why so few people do it.

> What's any blog? A person just presses a bunch of buttons on a keyboard, is that anything?

If it's a human writing it, sure: it's a unique contribution by somebody who put forth effort to help others.

If it's just LLM output, then you might as well have a blog posting the results of random math equations from your calculator. Was any significant human effort involved? Odds are no, but "authors" using LLMs are free to prove otherwise by providing their prompts.