I didn't read all of them and didn't agree with a lot of statements because it's written by some form of vegeterian creature(no offense). But "Meat eaters thrive on a high-fat diet." says a lot as humans can thrive on a high-fat diet too.
Let me quote the Inuit: “When first thrown wholly upon a diet of reindeer meat, it seems inadequate to properly nourish the system, and there is an apparent weakness and inability to perform severe exertive fatiguing journeys. But this soon passes away in the course of two or three weeks.”
And more: "It’s a beautiful thing. Energy overally increases, mood stabilizes, you think more clearly, that regular three-hour hunger for carbs disappears, you'll burn fat stores, you can skip meals with no noticeable effects."
It does feel good after you have stopped eating vegetables with lectins and other allergens and also fruits that provide too much sugar.