Board Thread:Naruto Discussions/@comment-1512913-20141023150833/@comment-1663248-20141024122817

No. He used it before whilst still adopting the 'Tobi' persona. An example of this is during Sasuke's battle with Tobi and Diedara. Sasuke ran right through Tobi with his sword, and Tobi fell to the ground. Diedara then told Tobi not to let his guard down, and then Tobi gets right back up uninjured. The fall to the ground was just a play.