Because a Mercedes E55 AMG (and several high-end FI sedans) would whomp on many Twin Turbo Z32's... so if price were not an issue, I could say "it's pathetic how a 4 door family sedan could beat a Twin Turbo Z32." The reason that video compared the 370Z to the 135i was that they are just about in the same price range.
I love elitists who aren't really elite in any way... they amuse me greatly.