Tranny mutilation surgery is an abomination and a war crime, but this kind of complication can happen from basically any surgery, no matter how minor or necessary. It's usually due to the patient having a fucked immune system. In this kid's case, I'd bet it's due to drugs. Xhe was probably a heroin addict to deal with the "gender dysphoria".

It can also happen due to malpractice, of course, but even in third world countries this is rare these days. They pump you full of antibiotics during any surgery.