If an LLM were capable of reliably detecting AI-generated content, then it would also be capable of producing content that does not appear to be AI generated.
So either A) LLMs are intentionally, universally making their content look AI-generated despite having the capability to do otherwise or B) LLMs cannot reliably detect AI output and their responses on the subject are complete BS.
> If an LLM were capable of reliably detecting AI-generated content, then it would also be capable of producing content that does not appear to be AI generated.
Those are two very different classes of problems. You do not automatically get one if you have the other, in any resource constrained situation. Yes, you can infinitely iterate a RNG into a content producer given a classifier, but that presumes infinite resources.
So either A) LLMs are intentionally, universally making their content look AI-generated despite having the capability to do otherwise or B) LLMs cannot reliably detect AI output and their responses on the subject are complete BS.