That is nonsense.  There are a tiny number of intersex people, but in general, xx people are female and xy people are male and feelz don't change that.

That doesn't mean that xy people can't wear make up, dresses and high heels if they want.  But it does mean that they shouldn't be allowed to compete against xx people, who have 25% less muscle mass on average and are smaller and have lighter bone density, because that means that in time, all XX people will be pushed out of sport.

Just as they were a century ago.