"... psychologist reached his conclusion after scrutinising the results of university aptitude tests taken by 100,000 students aged 17 and 18 of both sexes."
This right here tells me everything I need to know about the study. The sample is not representative of all men and women, only university students between the ages of 17 and 18.
If I had the energy, I'd point out a few studies that show the gender bias in university enrollement.
