1. Any peer-reviewed, replicated studies to cite?
2. "A lot of them flee in the first year..." Anecdotal evidence is always the best. However, is this different from any other competitive, high-stakes field?
3.IF we are all blank slates (I am not saying this author argued this, but others do), with the same  distribution of aptitudes, intelligence, emotional stamina and so on, then presumably there is no need to pursue diversity in the workplace because there is no real diversity to start with. What tech firm is going to risk hundreds of billions of dollars in capitalization by not hiring the best person?
By analogy, If there were a female hockey player with the same all-round hockey athleticism as that of Sidney Crosby, would she not be in the NHL next season? 
4. "And yet it moves..." Galileo Galilei.