I listened to that game when I was living in Atlanta. It won the game for Tennessee and I said to my wife that was the dumbest play I had ever seen (heard). It is still the dumbest play I have ever heard of.
Why are they still kicking the ball off after a score or to start the game or half? They moved it up to reduce injuries, so why not just eliminate it and give each team the ball at the 25?
Intentional grounding (spiking) has exception clauses built in. It has to be done essentially immediately after the snap or after picking up a botched snap. You can’t drop back and then decide to spike it.