What's wrong with him is not what I'm hopeful for. What I'm hopeful for is what Douglas Adams once suggested happened to the second-worst poet in the universe:
his own major intestine, in a desperate attempt to save humanity, leapt straight up through his neck and throttled his brain.
That might be more plausible, I've just seen Aphasia a few times, dysarthria is new to me, but it fits better with an earlier incident, where they claimed it was dry mouth.