This is a bad take... you're arguing that because Google is a subset of the total population so it's no longer subject to the averages of the population shows you either don't understand the memo (possible, most people I've spoken to about it haven't read it) or don't understand statistics. If, in a population, 90% of computer programmers are men then in any subset of the population we would expect the same ratio (with varying confidence based on the size of the population). The point of the memo is that it's possible that women are not as interested in computer programming (university enrollment should give us a pretty good picture on this) and therefore aiming for a 50/50 split in a 90/10 population is extremely misguided.