I tend to agree with most of what he says, but I’m skeptical to the idea that it’s always a bad thing to mix carbs and fat in a meal. It may be true that food in nature is either rich in fat of carbs. But our ancestors have probably eaten more than one kind of food at the same meal for a long time.
As long as you stay away from processed and high-sugar carbs I don’t think it’s a problem for healthy people to mix some unrefined carbs and fat – potatoes and meat for example. Unless of course you’re trying to lose weight or improve your diabetes etc., in which case the potatoes are out.