The real biological reason why there are few women in Google, tech sector which James Damore (who was hired) did not explicitly state is as follows
Google like many it and tech sector companies prefers to hire only good looking slim women and beauty is determined to a large extent by biological factors. A woman whose father and mother are extremely goodlooking is also likely to be goodlooking, though grooming and other factors play a role.
It is generally observed that most good looking beautiful women like google, tata sponsored eighth standard pass cbi employee gujju housewife naina, mother of two sons, are not very career conscious, not likely to work hard to get good grades, to be financially independent , they can easily get married to a rich and powerful man, who will take care of all their financial requirements. The beautiful good looking women can then lead a relaxed life of a housewife as most men, especially rich men are only interested in having a beautiful wife, and can take her of all her other requirement. Typically in India’s top engineering colleges, women make up only 5-10% of the class as beautiful women are not career conscious.
So usually the women who focus on their career, education, being financially independent are often not very good looking , fair complexioned, as they are aware of the fact that they may not get married and have to take care of themselves in their old age, However the tech and internet sector, specifically google brazenly discriminated against ugly women, stealing their resume, memory, savings and correspondence, subjecting them to identity theft, so naturally there are very few women in the tech sector, which meet google’s criteria of beauty and brains