That is some just-so-story that doesn’t present a disprovable hypothesis. There was a better-supported causal hypothesis floating around that exposure to the internet, in particular, turned women off of CS because the culture #onhere was so full of sexism. Try looking up “ambient belonging”: I remember some thing about all you had to do to get more women interested was change the decor to not suggest they were going to have to put up with sexist bullshit if they chose the field.

Do you realize that women aren't a monolithic group? Various effects can be at play at the same time - women preferring on average other kinds of work isn't an argument in favour of discriminating against those that do not.

Scandinavia has hundreds of years of mostly unbroken history in STEM. It is literally the home of the Nobel prize. It isn't really comparable to nations that have rapidly shifted their workforce and industries more recently.