He's alluding to the old 77% canard which has already been debunked. There's no pay gap between genders, the pay gap is between women who never married and women who have married at some point regardless of present status.
Something else he gets wrong is this "under representation in high paying jobs" canard. That's bad approximation again. The under-representation is in thing-oriented jobs versus relationship-oriented jobs. In Sweden, in all their equality, we still see mostly male engineers and mostly female nurses. It just happens that thing-oriented jobs pay more.
I'm assuming you're being downvoted for your flippant response, but you raise a good point.
I can't find the source, but an article was laying out that despite all of the social benefits offered to women in Scandinavian countries (child care, generous time off, etc) a lot of women were choosing not to work. That obviously skews the "pay gap".
Something else he gets wrong is this "under representation in high paying jobs" canard. That's bad approximation again. The under-representation is in thing-oriented jobs versus relationship-oriented jobs. In Sweden, in all their equality, we still see mostly male engineers and mostly female nurses. It just happens that thing-oriented jobs pay more.