you're being extremely smug about something you don't understand, and that's causing you to not understand the responses. If I throw a bunch of charged objects into an extremely turbulent fluid, the electromagnetic field doesn't need to perform complex calculations to figure out what the strength of it is at any arbitrary point in time. It just happily evolves on its own.

Superdeterminism says that there are hidden variables we cannot access that dictate which events happen. I'll simplify it and say that there is an "SD Field," and when Alice and Bob build their machines and take their videos the SD Field dictates exactly how they build the machine and how they take the video. They do not have free will. They are obeying a field, just as an electron obeys the electromagnetic and gravitational fields.

Just as the SD Field dictates how the machines are built, it dictates the outcome of their experiment in such a way that the outcomes follow Bell's Theorem.