It's not nonsense. Even those that liked the moves of McCoy and Poe acknowledged they were short term fixes as both were older players. They weren't younger, better DTs that were going to be part of the team's future.
So no, they have never really addressed the DT position other than try a short term patch job (Paea was another attempt). The closest they have come is drafting Hill, who appears to be nothing special, all because Marinelli talked the Jones' into taking him.
History is on our side here by the way. The odds are heavily in the favor of the Cowboys bargain shopping in FA.