That did not preclude women, and that seems to be a new area of study for this problem. Women aren't being pushed out by misogyny and male culture (according to this hypothesis) - they are self-selecting, or pushing themselves out. They have the option, but choose not to.
Except when it is part of some other goal - that is, women do use computers, just not for the sake of using computers (generally). Women are utilitarian in using computers to support other endeavors.
So women stopped studying computer science because they didn't have to anymore?
We can oversimplify if you (grandparent and the post to which you replied) like, but the attribution is wrong. Fields constantly diverge and evolve, and the PC revolution meant having access to advanced processing power without competing for time at a mainframe. Women didn't *have to* study computer science before, but it helped in knowing how to get this hunk of metal to give interesting answers.
And it's not that women didn't have to study it anymore - in many cases, the computer became part of the curriculum.
We could rewrite this entire article to say that (advanced) courses of study embraced computers as virtual assistants, which pushed basic computer science into many other fields, increasing the number of women who took CS informally along with their chosen major.
So you don't have to study a specific CS course of study in order to incorporate CS into what you really want to do. Which brings us back to women seeing CS on its own as not interesting, not helpful, or something else. And without further insight, we could stop here and write it off as personal preference due to the underlying brain structures that heighten verbal skills, and give up on all of this "not enough women in the field" nonsense and "men are pushing women away due to misogyny and male culture" beatings.
The next step is obviously to come up with some sort of number that tells us women should be 30+/-5% of the computer science course for X reason, and stop trying to make it 50% unless that reason itself exposes an obvious requirement to do so. Then given that non-CS people can work in software development, what percentage of an IT workforce should be women? What happens if we turn traditionally male cultures like start-ups into female friendly environments?
What if it's a tech company that does lots of completely non-software-related things, how many women should work at that place?
And let women, since they are not precluded and only excluded by choice, be underrepresented where women choose to be. And if we get to the end of all of this and realize that men are just being dicks and it was male culture causing problems all along, men will have no more excuse to fall back on to explain the difference. This is the first step in really getting to an answer, rather than pitting gender against gender in suppositions.