This sounds to me like they really mean big money, high growth enterprises and are out-of-hand dismissing the kind of people who start more traditional small businesses with no goal of ever becoming a Mega Corp.

I haven't looked at the data too much recently, but twenty to thirty years ago:

Women had trouble getting funding at all, plus typically had ongoing obligations to do the women's work at home, so they typically started smaller ventures with less risk and less growth potential. They were disinclined to borrow any money at all and completely bootstrapped it, paying for any growth out of earnings as they were able to afford it.

If your very definition of business de facto excludes the type of businesses typically started by women -- and no doubt other less-privileged groups -- you shouldn't be shocked when they are underrepresented in your data.