Is it plausible to assume that STEM fields and female participation is a case where stereotypes have very little effect? I think I'd need some pretty strong evidence for the idea stereotypes had little effect on any kind of career choice. Even less so for fields where any mention of stereotypes and gender imbalance garners a furious insistence that the stereotype is [i] irrelevant to anyone's advice or decision making [ii] also such an accurate representation of biologically-driven preferences it would be unfair for the gender ratio to change
Also, I would think that the person that claims discrimination would have the burden of proof.
Well yes, if stereotypes or discrimination play any role it at all in career selection, it rules out the possibility that the highly variable ratio of male to female computer scientists is determined solely by biology. This strikes me as a much stronger claim requiring much stronger proof than a statement to the effect that [the well-established existence of] stereotypes is amongst the driving factors in career selection; particularly given that the ratio of male to female computer scientists varies hugely by place and time in ways which would be very difficult to attribute solely to biology.
Since it's palpably absurd to attribute this to differences between Russian and other European female biology, I think you've just refuted the argument that biology is likely to be the sole factor determining career choices. Given that we have just proven that cultural attitudes do shape career choices to some extent, perhaps they are even partly influenced by some people's insistence that the only actually problematic attitude towards female participation in their field is considering women equally likely to be suited to the job?
I don't really understand your logic. The biology is the same in both places, but we can all agree that Sweden is 100 times more progressive. Even if you claim there are still stereotyping here, their effect would be much much smaller. How can that be reconciled with the much larger disparities we see in Sweden?