To see the numbers you'll have to follow the citations in the memo to Wikipedia and then its sources. The diagram is a visual representation of the traits differing in representation between genders but still overlapping and specifically pointing out that gender averages say nothing about an individuals abilities.
He's not advocating deciding what jobs people should do based on their gender, he's providing ideas on how to make tech roles more appealing to women based on female gender inclinations rather than simply hiring more women because they're women.
He's not saying it's all biology, he's just pointing out the biological angle and how to adjust for it instead of discriminating for it. You seem like you'd rather ignore the biology.