No it's not. They need approval from the RNC to do so, and the RNC has already said they won't issue a waiver.
This entire Santorum delegate count news release is laughable fantasy. The fact they claim Texas is "Going Winner Take All" when the RNC will never approve such a thing and everyone who understands the issue knows it is not going to happen goes to show what utter nonsense this is. Rick is grasping at straws and is fooling only those people who can't understand math or are living in some alternate universe where political reality doesn't exist.