One of the previously male-dominated field that the article mentions is computer programming. There is no other field in the article that has undergone such a fundamental shift from when women used to dominate the field. There were virtually no barriers to entry to the field back then either in the form of requiring a degree or societal norms ingrained from childhood.

Other fields mentioned either require longer hours or were simply more demanding. We can get into what are reasonable hours or demands in a separate conversation but all things equal, employers are going to pay more for someone who works longer and puts up with more demands.

For everything else, when you introduce half the working population to a field that they were once closed off to, wages are going to drop. I am not pretending that it's the only factor but a huge over supply of labor will cause wages to drop; all things equal.