Thought it was pretty close.Wouldn't doubt the PGA got quite a few calls about the ball dropping. Rule 16-2 covers it and I think he was ok, but just barely.
When any part of the ball overhangs the lip of the hole, the player is allowed enough time to reach the hole without unreasonable delay and an additional ten seconds to determine whether the ball is at rest. If by then the ball has not fallen into the hole, it is deemed to be at rest. If the ball subsequently falls into the hole, the player is deemed to have holed out with his last stroke, and must add a penalty stroke to his score for the hole; otherwise, there is no penalty under this Rule.
He never reached the hole to determine if the ball was at rest. He still would have had ten seconds after going up to it in my opinion. Eff the sofa officials!