Nah, this was Floyd being very slick, bringing up the 'L' and all. You have to watch the videos where Silva took it way too serious when Floyd said, in a manner of speaking, that he doesn't know who Silva is (he was making a point about dominance in boxing). Silva took it as disrespect and said so afterwards.
Part of the argument Floyd was making is that he's the greatest, most dominant boxer ever, and when someone brought up Silva, he didn't want to hear it b/c MMA is a different sport. They were trying to say that Silva is as dominant in MMA as he is in boxing, but Floyd was having none of that.
Anyway, with Silva's recent loss, this is Floyd's way of re-asserting the point he was making earlier, especially since Silva got so salty afterwards.