The DirecTV agreement with the NFL has various contractual provisions between those 2 parties.
The NFL can also negotiate an agreement with other parties.
The statement by Brian Roberts of Comcast is simply a smokescreen negotiating ploy, and he certainly knows it doesn't represent the facts.
Brian Roberts is simply just an egotistical jerk; he received the Comcast job because he is the son of Comcast founder Ralph Roberts. Brian Roberts has made it his life's passion to squash anyone and everyone. I truly believe Brian Roberts would sell his mother and anyone and anything else to further his insatiable quest for money and furthering his ego. In my opinion Brian Roberts simply is one classless act. I cringe at the fact that he will soon be the head of NBC. It will one of the saddest moments in US history when one of the most unethical and integrity challenged individuals in the world wins in his quest for NBC. Brian Roberts is the poster child for corporate greed.