Remember that, in America, people are supposed to be innocent until proven guilty and, so far, there is no proof (just talk).
He's not been found guilty.
However he has chosen not to go the route of arbitration which means pretty much accepting the implication that he is.
It's still a case of innocent until proven guilty, he just didn't fancy the idea of answering the case against him, it was a case of either accepting sanctions put forward by the anti-doping body or contesting them. He CHOSE not to contest. It surprises me that he didn't contest being as has obviously enjoyed the publicity along the way of being seen as being a very persuasive character up until this point. I'm not drawing any conclusions.
I do however think that retrospective sanctions are pretty much pointless, if the events themselves can't find fault at the time then it is the event itself that is failing the sport.
It certainly doesn't diminish in any way any good work he has done with his cancer charity either.