It's clear women on the whole are not drawn to STEM. It's not clear why but there does appear to be a biological component. It's certainly not primarily socially constructed.
That's my observation anyway. I haven't studied the issue in great detail.
I don't think I believe any of these three claims.
For these I don't think asking for supporting evidence would help - these aren't claims where you can easily point to a research paper, but these are interpretations of a large amount of data (some rigorous, some anecdotal).
But it's interesting that we have such different interpretations, worldviews if you will, of the data we've seen. I think women are drawn just fine to STEM as a whole (if by "drawn" you mean "innate interest"), I think they're somewhat structurally discouraged by socially-constructed barriers to STEM as whole and, importantly, quite a bit more discouraged to software engineering in particular. And I don't think there's anything biological about it (unless you count the fact that many people with wombs plan to bear children and nobody without wombs does, and long parental leave is a serious career hit, but I'd still argue that 90% of that is a socially-constructed barrier and not a biological one).
It's also clear that girls on the whole are not driven toward STEM by their adult mentors, and outside the bubble are actively discouraged from it.
> It's certainly not primarily socially constructed.
Certain, are you? Based on what?
Today, different families and schools push varying expectations onto children. This cultural aspect is layered on top of biological differences in body and intelligence.
If we remove cultural impediments and allow biology to express itself more fully, the uneven distribution of gender in different fields increases. In other words, the relative evenness of the distribution we currently have is socially constructed.
So I'm not convinced by the argument that women (and indeed many men) are dissuaded because they hold negative stereotypes of people and working culture in STEM fields. However, I'm willing to keep an open mind on this, so if this is true then more effort should be made to welcome in talented outsiders.
Of course this is just my belief, as a member of the industry, and not a scientifically-researched conclusion.
So, again, I'm curious to see evidence of why women's aptitude is poorly correlated with the specific industry of software engineering. (I would even buy, based on your argument, that women's aptitude is poorly correlated with academic computer science, but that's a very different field.)