Not a physicist, but I've been studying QM as a hobby for thirty years. The problem with superdeterminism (SD) is that if QM is true then SD is not falsifiable. SD says that all experimental outcomes are deterministic but derive from hidden state, i.e. some sort of "Cosmic Turing Machine" (CTM) calculating the digits of pi or something like that. So now what? The CTM has to be perpetually hidden from us, otherwise we could examine its state and predict the outcomes of quantum experiments, and that would violate QM. So if QM is true, then the CTM necessarily has the same ontological status as an Invisible Pink Unicorn (IPU). In fact, the deterministic calculations underlying SD may well be carried out by a literal IPU. If QM is correct then there's no way to determine this, even in principle.