Let's just think about this friend whose bike it is claimed to be. What exactly does he have to lose by saying it's his bike? Not a lot, apart from some temporary media attention. He just has to keep his mouth shut except for confirming his ownership, for which I am sure he will be (or have been) adequately compensated at some point. That might just be worth it to reduce the punishment for the rider. Whoever was involved in this must have been very careful in using a prepared bike in major races, and given that, they are also likely to have also have had such contingency plans organised.