His statement doesn't contradict itself at all, the DLC he is referring to is just that DLC, not on disc, not included in materials submitted for approval.
And changing release dates DOES cost money, sure they get pushed back at times, but that's not free!
What he said.
And yes some games like Mass Effect can afford it because retailers will do anything to get that game on their shelves, and Bioware and EA have money to spare. But outside of AA titles it's a different deal.
Also I think we can all agree that Duke Nukem Forever was a crazy money pit.