[fixed_truth]

I think that you've missed some of what he's said. He's saying that when we look a someone and decide if they are a man or woman it's not necessarily based on some direct manifestation of their sex, it's more about how they present themselves. Also he specifically responds to the hosts statement that today people being born male can say "I believe I'm a woman". He clearly states that people should be free to decide where they sit on the man/woman gender spectrum.
With sports yes he's exploring if whether sex is the fairest categorisation.