From what I recall seeing as a kid, and when working in my teens, that wasn't too unlikely.
There were a lot of women in computing, of various pre-Yahoo-IPO eras.
I think the relative numbers diminished dramatically with the dotcom gold rush, and the newer bro cultures, and gatekeeping.
Only in recent years have we started seeing more women in "tech" again.
There certainly is a lot of woke revisionist BS around. No doubt about that.
Edit: in my current book "This New Internet Thing" one of the characters, Cassie, wants to adopt a child as a single woman. I got advice on that process by Heidi Buelow (RIP), who was last at Oracle but worked on the Xerox Star, and adopted two children of her own (Cassie is not modeled on Heidi, except for that). Heidi unfortunately died while I was writing it, and I can't find any online obituary on her.
Since we're talking about "back in the day" naturally some of those people have crossed the Great Divide. You can find a few women in here as well:
https://decconnection.org/memorials.htm
Not a lot, of course. But not none.
A fiction protagonist is often the outlier because they have more interesting interactions than the median type and hence there's more material for the story. This is a pretty basic tenet of drama, not some woke invention.