The article in the OP is a classic example of a right-wing media publication trying to use some crazy fringe element to discredit the validity of being transgender
It's designed to make people think that trans individuals just flippantly choose one day to be the opposite gender, almost just for fun and/or to mess with people around them, rather than because they actually suffer from gender dysphoria
It's the same thing that used to be commonly said about homosexuality, that it was just a "sinful, decadent lifestyle choice" and not a condition that a person can't do anything about
race is also a social construct, but the difference is we have never seen a legitimate, large group of people who are driven to depression and self-loathing because they see themselves as a different race than their biological designation
these debates over how fickle identity politics can get when you talk to a real crazy are irrelevant, because at the end of the day trans people are stuck with their feelings about their own gender
given the insanely high rates of being a rape/murder victim as well as suicide, it's not like people are clamoring to choose to be transgender just for fun