Oh and your claim that they're being filtered out by sexism doesn't qualify as handwaving?
Look, if women are being unfairly excluded from the pipeline then fight THAT. Don't blame Google or Facebook or X company for hiring the best they can. They have "diversity consultants" on their payroll for christs sake. This isn't an issue that is gonna magically be solved in a few years. Making the "pipeline" more diverse takes years of investment and education and encouragement. What I take an issue is with people blaming these companies when they're actually doing a reasonable job of trying to become more diverse. As if these companies are the ones really holding people back. and if only they could overcome their biases they'd have a perfect diversity ratio overnight.