Not even close to the same thing. Yes, all pitchers leave the rubber as a result of the natural motion of pitching. But this is a deliberate movement to gain an unfair advantage. (my opinion).. BALK....BALK....BALK.
And I will add this.....Until a definitive approval comes from NFHS, NCAA or NAIA, the only opinion that counts is the Umpires.......Once approved, then I will happily agree that it is legal. Until then anyone who tries this with me gets Balked.