@roz It's a little more complicated than that I think. There's a graph in that When Women Stopped Coding article that showed that women dropped off sharply in computer science while still continuing to head towards parity of representation in other traditionally "mens work" fields.
A lot of it comes down to opportunities. That article (and others) talk about how girls entering CS degree programs in the 80's and 90's felt behind because they hadn't had the opportunity to work with computers as kids, unlike a lot of the boys (who had grown up playing video games). Girls interested in computers were often teased or discouraged from that pursuit.
These days - I can't throw a rock without hitting a "girls who code" camp/club/book/etc. for my pre-teen daughter. Lots of the girls in her class are into code, and just as tech-savvy as the boys. There's now better representation in kids cartoons/toys/etc. showing girls in STEM roles, so they don't see it as just a "boys thing". It really is turning around.
(Aaaand this is probably veering way off topic but whatever.)