The entire greater male variability theory (which is what is under discussion here) It claims that while averages for men and women are the same, you get more

The entire greater male variability theory (which is what is under discussion here) It claims that while averages for men and women are the same, you get more men at the high IQ end of the spectrum and also more men at the lower end of the IQ spectrum (which balance out the average). The whole argument is predicated on what happens at the edges of the normal distribution, not what happens at the center.