I don't think the whole of the problem of women almost entirely absent in positions of power is "women underperform due to internalized sexism", a significant slice of it is also "affirmative action" by the sexists, passing women over for promotion, disrespecting and devaluing their contribution. If you remove one thumb from the scales, consider that the other thumb might still be pushing them out of true. (This simple consideration is, alas, lost on the current USA supreme court.)
My third paragraph on the other hand is a commentary on the tech community as a whole, which is backed by my personal experience.
Your snide "trust the conclusions to the same degree as you do" puts you squarely in the camp of those who think it's of paramount importance not to crush prejudice an inch more than is absolutely needed, though, which is a bizarrely regressive position imo.
That's also a conclusion we can draw from this study, assuming we trust the conclusions to the same degree you do.