As a criticism, i don't see how that matters. An article written by a human at the quality level of gpt-3 has the same value as an article actually written by gpt-3. Knowing that gpt-3 actually wrote the article doesn't change its level vapidity. Either the article is vapid or it isn't.

But there's no need to accuse the author of being a robot. They could have written:

> This article is vapid. Zero substantive content, pure regurgitation

Now, I would still have downvoted such a comment. If I'm reading a thread, I clearly like at least the article's topic, and I want to read more on that topic, not dismissive comments telling me that it's stupid. But, at least the modified version focuses on the content, rather than the author.