Yeah, I think the real issue with the inevitable lack of a robust way of objectively determining the added value of an employee — not just at the BBC, but in most cases — means that isolating true sexist bias is almost impossible. And as you said before, some of that bias is historic, rather than, well, for want of a better word, acute.
Finding the actual page of a Hidden Brain podcast is something that has always baffled me — for some reason there is no direct link from the directory page to individual episodes. (Thankfully my podcast client simply downloads every episode, so I normally don’t need to worry about it.) The one in question is called Lost in Translation, and is here: https://www.npr.org/2018/01/29/581657754/lost-in-translation-the-power-of-language-to-shape-how-we-view-the-world
Enjoy (it is very good)!