2) tech is just the latest in a series. Comp sci degree enrollment for women DROPPED for recent decades - that's not a biological lack of interest. This has occurred in many professions - when the profession becomes high profile, the women are driven out.
3) you are proving the problem in the original memo. Instead of looking into any of the research on the topic, you are repeating what feels true. You speak with such confidence on the different interests of different genders, without considering how you know what the actual interests might be. (You're assuming what you see must be the result of interests, and use that to prove a difference of interests is the cause. That's a tautology) You assert that "no one seems to have a problem" with imbalances in other professions, when it is trivial to find people definitely have problems.