Nah, in the late 50s and until the 90s, there was around 25% on women in computer science in the US, and close to 50% in some countries like France an UK (i think a book was written on why in 2017).

I've talked to Pr. Emeritus Mallard a lot three year ago, who was a biology researcher studying genotype and phenotype in animal/vegetal populations (for context, he got his degree around the time we discovered ADN). From what he remember, there was a lot more than 50% women when he started, at least as "programmers", although they were barely viewed as clever seamstress at the time.

Each time he wanted to do a computer-assisted statistical study in the early days, the programmer was a woman (again, from what he remembers) and he always thought the field was dominated by them, at least for grunts work.