I don't think Kim is PF. It would be too risky. I mean, Federer must know it exists, but knowing it is there and knowing that it is by the girlfriend of an opponent is two different things. It's a bit like it being there is a bit of a laugh (although somehow I doubt Federer would think that
) but if it was by someone that close to Andy it could come across as disrespectful and taking the wee-wee. As much as I often think there is no love lost between Andy and Federer, I don't think anyone that close to him would take the chance.
I still think it is a man and I think it is a journalist, or at least someone within the sport on some level, but not an active player or one of their team in any way.