This quote is speaking about the distribution saying that i might be affected, not that women are in fact less able if they wanted to. For example if more women don't go and study CS, less women will be in CS, thus the general population of women will be less able to practise CS which means that the number of women in cs will be low.

As for the distibution of preferences based on sex. While some might claim that sex does not affect preferences. A Meta-study found robust sex differences in children’s toy Indicating that sex "might" be a factor in deciding factor. The categorical refusal of this claim to the point the mere fact of suggesting that it "might" be true let alone asserting it is taboo, is scientifically unfounded.

source: Study finds robust sex differences in children’s toy preferences across a range of ages and countries http://www.psypost.org/2017/12/study-finds-robust-sex-differ...