These are the countries that are the most egalitarian in the world, where 3rd wave feminism forms a major part of social policy, where women have an equal level of opportunity to men and the freedom to choose their own paths in life. The data shows that under these conditions, this freedom has a negative correlation to women choosing a career in STEM.
You can't say that this is a remnant of some patriarchal system of oppression, because as women's freedom has increased in those countries, their participation in STEM has decreased.