Have you read the memo? He does not do that. He talks plenty about averages, and explicitly mentions that averages don't apply to individuals.

Here is some news for you: The AVERAGE woman is not interested in technology as much as the AVERAGE man. If you think reality is sexist, so be it.

Does that mean that every woman is average? No. There are plenty of women interested in technology doing great work.

So why do you expect that there should be as many women working in technology as men? Why is it even a (US) problem?