Drawing conclusions about "innate" differences between men and women from this data doesn't seem valid. There's a lot of research left to eliminate confounding effects on participation that aren't covered or investigated by the "Global Gender Gap Index" (e.g. cultural attitudes towards women in STEM, or on-the-job discrimination). Scatter-plotting two datasets available on the internet doesn't feel like enough research for me to dismiss reports from women that they are discouraged from CS before, and during, their careers.

The trendline cited in the article isn't even conclusive, either—eliminating outliers would reduce it almost to noise. Even if it were, there hasn't, to date, been any reasonable explanation for why women's "innate" biology would make them any less interested in professions whose parameters and limitations are purely human-constructed and invented in the past century. Whatever happened during the evolution of the sexes was certainly not informed by the interestingness of C++.