@Proton2: Nothing prevents Dr. Dyson from being wrong from time to time. Does his math account for all possible variations (aka variables)? Say, all that's probably going on - in reality, as It happens (the R constant?).
Did he forget R? What is R, exactly?
EDIT: Removed "This amounts to arguing about the relative - and safe - amounts of the ingredients that make up a sausage, floating around fire." That's a reflection of the initial, illogical, human reaction. Logic mandates that this irrelevant information be removed from any formulation of a sensible question. Emotion is a side effect of sense. I think I finally get Jamie, man.