Perfect knowledge about everything is only possible if strict determinism holds.
What’s “perfect knowledge”? If you know there are two copies of you in idential rooms, with different consequences of decisions taken there, it seems like a perfect enough description of what’s going on. Determinism seems irrelevant in this sense as well, it’s only superficially similar to what it takes for a decision algorithm to be runnable, so that its reasults affect things, and that property is not “determinism”, just a setup with some sort of laws of computation.
What’s “perfect knowledge”? If you know there are two copies of you in idential rooms, with different consequences of decisions taken there, it seems like a perfect enough description of what’s going on. Determinism seems irrelevant in this sense as well, it’s only superficially similar to what it takes for a decision algorithm to be runnable, so that its reasults affect things, and that property is not “determinism”, just a setup with some sort of laws of computation.