MandiGoodly wrote:  
"The fact that women as a whole make less than men as a whole (an income gap) is continuously portrayed as women doing the exact same jobs as men, with all the qualifications etc, equal, being paid less than men"

Without doubt, the analysis should be more detailed than that.  In fact, it almost always is.  

Without denying that a few people have made the king of claim you state, it's hardly the basis for concerns about the wage gap.  Most Canadian jurisdictions passed laws against this sort of thing in the 1950s.