That surface has nothing to do with clay.
Blake produced some good shots, but it was also obvious why his results are less than decent on clay. After hitting approximately two shots cross court he went down the line, some of them attempts to hit a direct winner. Even juniors know that is pretty much a suicide on clay. Worked for Blake today, but RG will be a LOT slower. He might actually have to use some topspin with his shots there.
I am quite sure that he knows what that term means. Or at least he heard about it... on TV... or something...