I happen not to agree with them, but leaving that aside they're often that Ok fine, it's a pipeline problem^, but the solution is to address that at every stage, not just the beginning.
(^meaning for example schoolgirls aren't sufficiently interested and encouraged into STEM so university applications are low, so admissions are low, so graduations are low, so job applications are low, so offers are low, so employer gender ratios are low)