This tenet is absurd and provably false.
I coach an after school program in robotics and programming at my local elementary school, and I agree that this is baloney. The parents are pushing hard for their girls to pursue tech, and it is the girls themselves that are disinterested. We have tried many things to keep girls in the program. I recruited an engineer mom as a co-coach to provide a role model. We let the girls form "all-girl" teams, so they can use more collaborative teamwork, and consensus decision making, which they feel more comfortable with, rather than the hierarchical teams that is natural to boys. But we still got only a few girls to sign up this year, and most of those only signed up because of parental pressure, and half of them dropped out when the try-outs for the school play were announced. It is very frustrating, and I don't know what the solution is, but blaming the parents is hogwash. I don't see that at all.