I disagree with that view, mostly because I don’t think that free will means completely random. Imagine the goldbach conjecture, there are two simple rules, divide by two if even, multiply by three and add 1 if odd. If you take any number, it is impossible to determine when that number will enter a loop, unless you go through the whole process. The brain is like that, but a trillion times more complicated. Is the brain deterministic? Yes. But does that mean you can determine what choice someone will make? No.