So how do you know DHH doesn't meet that threshold? (I don't think it's clear either way, but still "most common young nerd mistakes" is pretty dismissive.)
He might, but he certainly hasn't demonstrated otherwise. In particular, he's not saying, "I see where the REST crowd is going, but their crucial mistake is X." That, combined with DHH's well-earned reputation for arrogance, makes me think he's just doing his usual.