I'm pretty certain that over the preceding months his barrister will have dampened any deluded hopes he had of being acquitted.
He will have been advised to plead guilty, prior to the Nick and Joe apparition and even when he came up with that he would have known it wouldn't fly but at least it gives him an excuse, however implausible.
I've commented at length upthread at the reasons he is prolonging the inevitable, so I won't bore everyone again but trust me, he knows he's going down even if he will never take responsibility for the reasons why.