Outside the system, obviously. And that makes the claim trivial. Even in Newtonian mechanics you couldn't see the whole universe at once, let alone to perfect precision. But if you're outside the system looking at some accessible representation of it, then it doesn't matter whether it's quantum or classical - a god's eye view is possible. I've done simulations of (simple) quantum systems and it was totally possible for me to see all outcomes from an event that would normally cause decoherence and make coherent superposition impossible. That we can't do that for the universe is just a matter of our being in it.