Hypergamy is simply that women largely date across and up, never down. They seek the high value men. She's constantly scanning the horizon for the BBD.
50% of women admit to having a backup husband.
There's nothing wrong with this except that women deny it so often.
Al Kevin is saying is that if women demand a 9 or a 10 then they had better be a 9 or a 10 to men. That is it.
OK Cupid proved that 100% of women feel entitled to 20% of men.
All of this is hypergamy. If you want to dispute Hypergamy then you have to address the statistics. This is also what Kevin says.