This is likely because there is no airwing aboard.
I don’t have any doubt that turn could be accomplished with planes on deck. But it is a certainty that the planes would NOT have six point tie-downs. I am certain it would be 12 or 24 point tie downs.
But I am confident it could be done.
I should add that while I think it could be done with aircraft tied down on the flight deck, they might not simply because it isn’t worth the risk.
After all, in this kind of test they are testing the ability of the ship to turn, not the ability of planes to stay tied down during a turn, so they might just do it when there is no air wing.
I'd seen WW2 documentaries USS Enterprise CV-6 several times evaded torpedoes and bombs dropped from Japanese planes while waiting to recover planes and some waiting to take off in the battle of Guadal Canal. I think it's different between war time and peace time. This USS Abraham Lincoln CVN-72 must just came from dry dock routine maintenance on sea trial why on airplanes onboard.
