The core belief is that if it weren't for gender socialization, approximately equal numbers of boys and girls would want to be programmers, but instead the numbers are skewed by how we raise children and steer them toward pursuits along gender lines.

To think otherwise holds an implicit assumption that somehow our gender so radically alters our brains that it determines what professions we pursue as adults - not an unpopular opinion among the internet's legion of armchair evolutionary psychologists. Given your use of the term "inclinations to certain tasks" I assume you are more in this camp, but since you seem genuinely curious I wanted to provide the opposite perspective.

You can also consider how the medical and law professions used to be entirely male dominated, and no doubt many people said this was because women were biologically unsuited to fill these roles, yet now the numbers of graduates in each field are swiftly becoming equal. The goal of promoting women in tech is so that in 20 years we will see similar equal numbers in engineering.