I disagree with Florio's take. He's making stuff up and interpreting the rule in a way that may well not be correct.
Would not the game clock start running immediately upon the snap of the ball, at least in theory? Would not the spike stop that clock from running? How do you interpret the "stop the game clock" wording in the rule.
Who knows! This isn't law, this is NFL Mickey Mouse Law.
Item 3. Stopping Clock. A player under center is permitted to stop the game clock legally to save time if, immediately upon receiving the snap, he begins a continuous throwing motion and throws the ball directly into the ground.