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.