Actually, I think this is not what he is saying at all.
For example, he cites CT in one of those articles I linked as carb-intolerant, and Milos Sarcev as carb-tolerant.
Both heavily exercising individuals, by any stretch of the imagination.
He even classifies himself as carb-intolerant.
Look, we all know Poliquin likes to speak in extremes. But many of those extremes are rooted in truths. He's a smart guy. You could certainly do worse as a source of advice.