Aren't those effectively the same claim? If we take his non-bias cause to be true, that directly means that women have biological disadvantages to becoming programmers. He is in fact saying that's why the gap exists.
His facts aren't even controversial to anyone who knows the science at this point. Google has basically shown themselves as anti-science and evil.
More philosophically, there are compelling reasons to favor "equality of opportunity" and "freedom of choice" over any "equality of outcome" that can only be achieved through coercion and discrimination. At the very least, if someone doesn't want to do something of their own accord, it is hardly doing them a favor to coerce them into changing. And from where comes our moral standing to judge the preferences of other people anyway?
Do you mean black people or women? Or is this an attack on educated people regardless of their gender or racial orientation or identification?
The Mismeasure of Man is a 1981 book by Harvard paleontologist Stephen Jay Gould. The Big-Five model which underpins most of the relevant research in psychology) dates to the mid-1990s. If you want to attack it for being unscientific, you will have to learn about it. Good luck.
If some women, on average, want to do things differently than men, on average, that will result in some apparent gap in the averages -- not because of advantage, disadvantage or bias, but because you're looking at a difference in average preference.
As an example, I could present a graph showing that most Italians are Catholic and argue that it shows a genetic predisposition. But, such an argument would clearly be absurd.