While a possibility, I seriously doubt it. This was a stage stunt, and staged by minions who think he is probably holding an assault rifle.......no one I know who uses extended tubes bothers with one extended and one flush mount
All I know is that I have seen shooters with a single extended choke in their o/u and I have shot with one when in a hurry to join a squad on the trap field as I rushed from shooting skeet. Then, bretween rounds of trap I swapped out the second skeet choke for an IM.
Another reason for shooting with a single extended is for some reason you only have the one with you on the particular day.
Were the White House to stage a stunt, I think it would have come up with two like kind chokes.