But if he travels back in time to kill Hitler how can he run on that platform in 2012 and if that platform doesn't exist how can he travel back in time to kill Hitler in the first place.......aaaaarrrrrrgggghhhhh.....
It's simple really: If he goes back in time and kills Hitler it creates an alternate time line where another German steps into the space that would have been filled with Hitler in our universe. In that time line (TL2) Vermin Supreme 2 goes back in time to stop what we would call the New Hitler and creates TL3. VS3 goes back to stop NH2 and creates TL4. This goes on for a while until someone comes back in time to stop Vermin Supreme Prime and prevent the whole "Multiple Hitler" Time Loop. That creates a whole other Time Loop, but it also ensures immortality for elephants somehow, so everyone is OK with it.