The article mis-states their case: women earn 52% of chemistry undergrad degrees and 41% of straight-up math degrees. The problem is not math itself but the culture surrounding Engineering, Physics and Computer Science in particular.
(The following line might have been feminist once: women have agency and are not puppets for men. When you see a group of women doing something, if your first thought is "What have men done to cause this?", Occam is not on your side.)