I knew this and it's still infuriating.
They glossed past it, but the idea that men are the default human and women are extra has been around for centuries(at least.) It doesn't make it any easier to know that medical funding still largely excludes the female experience with all we know today.
Another common bias was disproved when early psychological studies, at least a hundred years ago, sought to understand if women truly were more emotional and less rational than men. Even that old research found no disparity between genders. This is important because it remains a common bias in medical research that women are more emotional and likely to misrepresent their symptoms, no matter how many studies have come out since then that show the opposite is true. It remains part of the subtle drive to keep women out of medical trials and impacts the kind of care and attention we recieve.