Cutting carbs helps because carbs aren't filling/satisfying. That's true. But he wasn't making that claim. He was making the old woo-woo claim that you can eat

Cutting carbs helps because carbs aren't filling/satisfying. That's true. But he wasn't making that claim. He was making the old woo-woo claim that you can eat way too many calories in fat and still lose weight. The only way to lose weight is to have a calorie deficit.