So, instead of asking "what stops 99.99% of women from founding [ ... and 99.98% of men ]", I think it might be more productive to ask "what causes 0.015 of people to become founders".
Curiosity, a lack of knowing the risks and a drive to know what's inside the box and how to make a better box, a road to a different kind of life, for themselves and/or those around them.
Those seem to be the common factors between all entrepreneurs that I know, no doubt there are others.
Not only would that be more productive, I think it would make for a much more interesting study. What are the common traits found in the 0.015% of women who choose to create startups, and how can we encourage these traits in other women who have an interest in entrepreneurial ventures of any kind?
Answering your question seemed to be a big reason for writing Founders at Work to begin with. I agree with your point, but the parent article seems to be expanding into this case, rather than changing direction.
So, instead of asking "what stops 99.99% of women from founding [ ... and 99.98% of men ]", I think it might be more productive to ask "what causes 0.015 of people to become founders".