Could it be an enhancement to change humanity into 65% women? or even more, thus giving on average more people a chance to parenthood?
Not to mention all the other reasons for more women, such as natural kindness, risk aversion, extended lifespan...
You didn't read the linked article, did you? Short version: there are trade-offs for different traits.
There's an idea I've seen a number of times that 80% of women have had descendants, but only 40% of men. A little research tracked it back to this, but the speech doesn't have a cite and I haven't found a source.
The reproduction rates for men and women (possibly for the whole history of the species) seems like the sort of thing which could be found out, but I'd like more solid information.