Normally, I'd be inclined to warn against hyperbole, but I know you and, more importantly, I've seen a lot of the field, and I can't disagree.
And I think you know that, except for comedic purposes, I am much more inclined to overly cautious, much qualified statements as much expressing my degree of confidence as asserting that my contention is true or valid.
But in this regard, I'm afraid he's just stunningly thick. There's no one so stupid as those who won't learn and refuse to grow.