The interviewer specifically said contact after three weeks. He was very clear on that.
Nope, I haven't contacted them. I was given several bouts of interesting news literally within hours of the interview which is making it look like even if I get in, I will have to defer or possibly withdraw anyway from all schools. So if they want to keep their decision from me for the next few months, that's ok. I'm in no rush to get their decision. I am waiting for my mentor to get back to me on his advice on what specifically to do, given the new information is HUGE, but I think he is trying to torture me.