Call me old fashioned but getting a basic fact like that wrong because a story was already written for you is a bit of a mickey mouse error for a national newspaper.
I don't particularly want to defend the Guardian. However, when you are using agency copy for a court case, you have to be incredibly careful. Most newspapers will not change details in the copy because you need to be accurate.
To me, the bigger problem is the court referring to this vile man as a woman in the first place.