>>11550707In determinism, you can still have physical processes which are, for all practical purposes, independent. For instance, you could measure atmospheric pressure fluctuations on the other side of the Earth as a pseudorandom number generator, and use those numbers to determine detector positions in your quantum experiment of choice. In a deterministic world, there is no probability in your choice of detector or in the quantum experiment's outcomes, but you could still reasonably infer that the quantum system's outcomes shouldn't be heavily directly correlated with those pressure fluctuations on the other side of the Earth, since the causal influence between the systems is extremely weak.
On the other hand, superdeterminists would say that, even though the pressure fluctuations and the quantum system are barely causally connected in the present, the Universe happened to have just the right initial conditions to make them correlated anyway. In Superdeterminism, the Universe's initial conditions are such that every measured system is correlated with the information you use to set up the measurement, meaning it's impossible to ever assume the independence of two systems.
To me, it sounds like a ludicrously grandiose cosmic conspiracy theory, but to each their own I guess