Myself: The man actually suffered a stroke, and was left unable to talk.

Jay: That's no excuse for having given half an argument (if even that) for decades.

You are joking, surely?

Perhaps he has elaborated on this and we just don't know about it yet? After all, I have never seen this transcript before today but, evidently, he gave this particular speech some time ago. We know he talked a little bit on the WHotM? video, but it would seem that shortly after this he suffered a stroke.