Truly, he doesn’t know. He hasn’t got a clue. As usual, he doesn’t even suspect that he doesn’t have a clue. When he finds out about it — which he probably will, because one of you will comment about it at WUWT and the comment will be deleted (they can’t allow pesky truth to appear at WUWT!) but he’ll still find out — he probably won’t believe it.
Bob Tisdale has another post at WUWT which is actually titled “Warming Rate in the US Slowed during the Recent Warming Period.” Apparently he believes this — because he knows not what he’s doing.