Well the current gender gap is
26/74, so if he thinks we're not yet to the point of the natural gap, then we can't go very fucking far before we hit 50/50. Unless he's suggesting that men aren't naturally attracted to STEM fields and that women should dominate those fields.
Regardless, it's still fun seeing that quote where he somehow manages to simultaneously hold the idea that a natural gender gap can exist, but that the best explanation for the current gap is sexism. All sorts of non sequitur up in this bitch.