Pointing out more weirdnesses may by now be unnecessary to make the point, but I can’t resist: the estimate also seems to equivocate between “number of people alive at any moment” and “number of people in each generation”, as if the 900 million population was comprised of a single generation that fully replaced itself each 31.125 years. Numerically this only impacts the result by a factor of 3 or so, but it’s perhaps another reason not to take it as a serious attempt :)
Pointing out more weirdnesses may by now be unnecessary to make the point, but I can’t resist: the estimate also seems to equivocate between “number of people alive at any moment” and “number of people in each generation”, as if the 900 million population was comprised of a single generation that fully replaced itself each 31.125 years. Numerically this only impacts the result by a factor of 3 or so, but it’s perhaps another reason not to take it as a serious attempt :)