It’s poor logic, a non sequitur. An absurd reduction. By your argument anyone who hasn’t written a great literary work is a poor writer, and would be bad at writing online comments.

LLMs aren’t lacking in the sort of writing skills that make for superficially good content. They know grammar, they know rhetoric, and they know their audience. You can’t tell them from a human on their writing skills. Where they tend to fall down is their logic and reasoning skills, and unfortunately it seems you can’t use that to distinguish them from the average online opinionator either.

No, that is a mischaracterization of what I wrote. They are great writers if you enjoy formulaic writing.