> You should not use LLMs without disclosure because LLMs at bad at writing.

That's not how i read the article. The author more-so claims that the proof of effort by a human was large part of the credibility to the writing; Proof that the author of the text has thought it through and come to their convulsions though effort and reflection, and spent effort articulating that into words they expect other humans to find insightful.

If i see LLM signs; did the author just rephrase with AI model or did a AI model content farm produce the whole post based on the prompt "write a inspiring linked-in post"?

Disclosure of LLM use is simply the author addressing the concern and building a case for why the article is worth reading.