[munksbeer]

Your argument boils down to assuming there is true randomness in the universe. You need hardware level rng with a natural source of entropy to generate non-predictable random numbers, but even then you're just at the point where maybe we could predict the randomness if we could go low enough.

We can't, so at the moment it looks as though the universe might have true randomness (I'm very sceptical of this).

But even then, so what? Does that mean free will is just decisions with some true universal randomness thrown in? How does that give you free will if it is just random? And then we're back to, what does free will even mean.