BL2 GOTY DLC disc not showing up on PS3

A few months back I decided to get the BL2 GOTY edition because my copy of BL2 was getting old. I already had all of the DLC for the game and decided to loan the DLC disc to my cousin who had BL2(digital version) but did not have any of the DLC (I assume). He sent me a message saying that it’s not showing up when he puts the disc in. He’s tried shutting down and restarting the console with no luck.