Those are good points, but just below the pictures he states an important result from his study: "I picked examples where users scrolled more or less all the w

Those are good points, but just below the pictures he states an important result from his study: "I picked examples where users scrolled more or less all the way down — often there's no viewing of the bottom because users don't scroll that far." I don't know exactly how frequently "often" is, but I think those examples were just to show what happens when people actually do scroll down. He's suggesting that most of the time they don't.