That seems to me like a lack of imagination on his part even assuming he has some grounds for the "2 second" rule. How does he know that people remember it via

That seems to me like a lack of imagination on his part even assuming he has some grounds for the "2 second" rule. How does he know that people remember it via "reading out loud to themselves"? Maybe they visualize it instead. Maybe people chunk it into a 3 digit and a 4 digit number, like a phone number. Why should "reading out loud to yourself" be limited to the speed of actual speech anyway?