Re: In my 50 years' experience...
I think you might have a point there - I started in the biz in the early '80s and the mix was pretty equal to begin with; possibly for the reasons you mention - companies would take bright people on and train them, regardless of qualifications. We had women managing, programming and working shifts as operations staff. Chromosomal arrangements did not appear to stop anyone progressing within that ecosystem according to their interests and talents. Plenty of casual workplace "sexism", but misogyny? No SJWs back then, but I (and everyone else I knew) would have considered anyone who indulged in that a complete bastard. If anything, since then, we have become even less tolerant of such things, so I'm not entirely sure that argument stands up, except in the minds of those who thing that everthing is "becoz, the Patriarchy".
What I have noticed, is that when I took the techier path and got into the world of operating systems and low-level languages, the proportion of women fell off a cliff; they seemed to prefer the Systems Analyst, Business Analyst route instead. Nothing wrong with that, it's all important, but there does seem to be a point at which women, in general, lose interest in computers. So it may just be that your observation that Computing degrees as an entry point for the industry puts women off by making the first hurdle somewhat boring and abstract, rather then practical. Of course, this is all anecdotal,
So, I think that the article's thesis that the problem is "teh menz" rather than a choice made by women is horseshit; how to make IT attractive when these choices are made is the real problem.