I like the DL talk, but it is just talk at this point.
He knows he can use Corbin as a scapegoat for everything that went wrong this season and he is going to use that to create optimism. I assume he didn't have much control over Corbin's rotations, but let's not forget that DL is the guy who failed to trade Marvin or Jefferson to force freed time for Kanter/Burks.
He also signed Lucas, Garrett, Thomas, Clark...drafted Burke and Gobert, and traded for Rush, Jefferson and Biedrins to land us a bunch of draft picks and keep our books in nice order to sign our players and retool the bench this year.
I'd say he has more than backed up his words with actions.