The idea that there is a constant %P of an Einstein for a given population is an overly simplistic view on human creative drive. So obviously thinking that you will get a thousand Einsteins out of a population of 1 trillion is simpleton "math". Ideas matter, culture matters, availability of resources matters. You could have a trillion people like in the movie WallE and get not a single scientific advancement out of them. In the order of importance I dont think the total population size is really a significant factor here.
I think Jeff Bezos is smart which is why I doubt he holds to any comments indented for layman audiences.
