The basic issue here is we're presented with this memo and told that he wrote all this stuff in order to... do what, exactly? If not this, then what point was he trying to make, or what position was he trying to argue for? Was he just citing a bunch of things for no particular reason whatsoever? And felt that this "memo about nothing" was of such Seinfeldian importance that the entire company needed to read it?

Or we can ask ourselves: what conditions would have to hold for someone to think all this was relevant and important to write about? And the answer is that if we want to be charitable and assume there's logical coherence to what he was thinking, the conditions that need to hold are something along the lines of "he thinks women are, for hard-coded unalterable biological reasons, less fit than men to work in tech jobs at Google".