Whether or not a range of 30% is "huge" is a subjective judgement, but that's besides the point. The point is, there are zero observed instances of women forming the majority of a the technology workforce in any county.
I'm not sure if it's even possible to put countries in a binary between patriarchy and matriarchy. Instead, the study presented put countries on a scale that measures overall gender equality. And what difference we do observe is that patriarchal countries have higher rates of women in tech, but still lower than parity. Countries with gender equality (is this what you mean by "matriarchy"?) have low rates of women in tech often in the 20-10% range. So in "patriarchies" we see more female representation, but still lower than the majority and in egalitarian countries we see
> The nerd/geek being an awkward boy with glasses troppe is specifically a western concept for example.
And yet, the disparity between women and men in technology exists outside of western countries. Thus, attributing the disparity between men and women in tech to tropes like these is not effective line of reasoning. This is exactly the point that I'm making: attributing the gender distribution in tech to social factors is difficult when said distribution is observed across a wide variety of societies.
> Women in Eastern Europe worked in factories side by side with men for generations.
This was the same case in Western Europe and Asia as well - I'm not sure why you chose to highlight this fact.
> Gender roles does not equal your concept of gender roles like women not liking/belonging/choosing not to be in tech.
I'm not sure what you're writing about here, this sentence does not make sense to me. The point is that highly unequal societies with strict gender roles see more women in technology than more egalitarian societies.
And for what it's worth, while 20% representation in tech in the united states might seem low at first glance it's actually not at all uncommon to have fields that are >95% one gender or another. Tech is on par with "Health practitioner, support technologists, and technicians", "Loan interviewers and clerks", "Printing press operators", and a couple percent above "Couriers and messengers" as far as gender disparities go [1].
1. https://www.bostonglobe.com/metro/2017/03/06/chart-the-perce...