That interview with the Danish individual is insane, BlardyBlar! We have truly reached peak insanity with this. They seem to be making a protest to show that they can identify as female without actually presenting as female in any way from name to physical appearance, clothing or voice. I wonder if this person is really trans or just making a protest at the absurdity, in their eyes, of the gender binary.
There is nothing necessarily dangerous about the genders mixing in changing areas. I've been to spas in Germany that were clothing optional with both genders but I had my spouse with me. I would never have gone there as a lone woman.
If this is a trend for the future, we will see many women choose to avoid swimming pools and bathrooms and other areas that are no longer women-only spaces. It's saddening to think about.