Google's current programs are ineffective and discriminatory, so alternative programs and work culture should be considered to achieve higher diversity.
How big part of the memo is focused on differences between the sexes? The section called Personality differences that everyone talks about is:
11 lines, 245 words, 1662 bytes.
Even if we include the only other place in the memo which reference this section (Non-discriminatory ways to reduce the gender gap), we are only adding a total of 7 lines, 222 words and an additional 1402 bytes.
The large focus of the memo was political diversity. About 97 lines, 1671 words and 11071 byes was written on that topic.
It is a result that the author of that memo should have reached after counseling and seeing evidence supportting of /equality/ programs actually being about equal treatment (or at least fair, as in having multiple possible measurements and a consistent policy of utilizing the best scores to reach a determination.).
I feel like a lot of animosity was allowed to fester among all parties due to a lack of intelligent, open, and respectful discourse about problems and perceived problems.
Some of his suggestions implied that Google work practices could be more welcoming to people who enjoy more teamwork in their day-to-day (the bit about pair programming). And he mentioned that more flexible work arrangements would benefit people who wanted a different balance of work and family life. Both points imply that women want those things more (plausibly true, but I think that's an empirical question). So he thinks women generally want to work differently, but that's not saying he thinks they do worse work. If he thought that, he'd recommend putting women in less important roles or giving them easier work.
(but he makes factual errors, so his argument is false)
Women are perfectly capable of choosing jobs they like.
That leaves a lot out, but it's the high order bit.
"Non-discriminatory [against men] ways to increase women's representation in tech include making engineering people-oriented (rather than systems-oriented), disincentivizing competition, endorsing part-time work, and making it socially acceptable for men to leave tech and leadership for traditionally feminine roles, but a meaningful application of these strategies would prevent driven employees (mostly men) from working extra hours or taking extra stress, which would have disastrous consequences for Google's success."