There have been a couple of threads on here pondering how deliberate David Mitchel is being in his decision to use "Woman - Adult human female" and "Man - Adult human male" as definitions on the show.
I've just listened to Episode 5 and at around 19 minutes in he launches into a delicious fury about the ridiculousness of saying that oranges are berries. Perhaps I am overthinking it, but the language he uses seems so deliberate - talking about taking an established definition and applying it to something else - that I would love to think it is a covert take down of TWAW/ gender identity bullshit.
Have a listen and see what you think!
www.bbc.co.uk/sounds/play/m000kw52