I read it as, this study demonstrated that you can't necessarily apply to women what you learn from a study conducted with only men. And that perhaps there is validity in conducting studies that include women or are specifically about women.

I'm more of a social science person, but as I understand it sometimes you aren't going to be able to gather huge swaths of data. You have to balance out the costs (time, money, person power, availability of people to study etc.) of collecting the data with the nature of what you are studying. And then interpret your findings accordingly.

There is always the risk that it gets misinterpreted when it hits the mass media.