However, the 'equal opportunities don't lead to equal outcomes' argument is often used as an excuse to ignore inequality - if we all pretend we've all got perfectly equal access to opportunities, we can attribute any difference in outcomes between groups to group preferences and call it a day.
Yes, I'd expect that in a world where access to opportunity was truly equal, the gender balance of founders would still be skewed. But that doesn't imply that there's equal access to opportunity in tech today, and it certainly doesn't mean we can say 'no gender problem here' and stop thinking about the ways we inadvertently discourage women from doing what we do.