There are lot of grey areas; for example, your GP comment wasn't just generated—it came with an annotation that you're a lawyer and thought it was sound. That's better than a completely pasted comment. But it was probably still on the wrong side of the line. We want comments that the commenters actually write, as part of curious human conversation.
I have a feeling that he meant something akin to spam, not to AI-assisted comments addressed to specific points.