> That alone says nothing about the presence or absence of systemic discrimination.

And, you'll note, I never claimed it did: I cited it as a fact about the gender imbalance in STEM which is not explainable by the facile “men like dealing with things while women like dealing with people” explanation which you described upthread as being, on its own, a refutation of the idea that gender imbalances in STEM are in any part due to systemic discrimination (which could only be true if it explained all aspects of STEM gender imbalance and left no room for systemic discrimination.)

Were it offered merely as a factor which explained some subset of the gender imbalances in STEM, that would be more reasonable.