Not about the uterus specifically, but they explain a bit of the reasoning in the article

In Whitley’s case, the problem was how the severity of kidney disease is assessed. The usual protocol is to calculate a patient’s “estimated glomerular filtration rate” (eGFR), which measures the amount of a certain waste product in their blood and therefore shows how efficient their kidneys are at filtering it out. If the eGFR is below a certain level, it’s an indication that their kidneys are failing and they are eligible for a transplant.

There are several different lower limits for an eGFR, depending on things like a person’s weight, age, gender and race, which are intended to reflect the natural variation in the human body. Based on the female cut-off, he would have been allowed a transplant immediately. But he’s registered as a man on his medical records, and this meant his doctors used the male eGFR level. He wasn’t put on the list until he reached it – a decision that ultimately delayed the surgery by over a year, and very nearly cost him his life.

“It was really cute and awesome that I was treated as male, but in being this way, they didn’t necessarily take into account the body,” says Whitley, who points out that, though he has been taking testosterone for around 15 years, it’s a relatively small dose. “I was born female and I identify as male – they should have probably have set my limit as somewhere in the middle.”