The slides don't actually mention ios. They probably just
assumed...and i also assumed they knew what they were talking about. Assume makes an ass out of u and me...
So I did more research. There already is a backbreaker game on the android market that works on all kinds of android phones (Droid X, SGS, etc) and it looks like nvidia is comparing the new version with that generic android version. But it appears all they have done was made the tegra version on par with the ios.
Fishlabs is the one claiming that tegra 2 is much much better than powervr on iphone4.
Galaxy on Fire 2 coming to Android - FISHLABS Forums
one response: "There is thing bothering me... Is Nvidia Tegra really so powerful GPU? Graphics of Galaxy on Fire 2 look uncomparably better than on iphone 4 or even iPad... It is not possible to render textures this quality on Apple devices?"