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.
"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.