You could make the same argument to say that your PC adding 2+2 is indeterminate because it has the same underlay of supposed random quantum behavior. But at our material level, the world is pretty deterministic just as your PC or phone adding 2+2 is. And as far as neuroscience has gathered, quantum randomness hasn't affected it enough for those scientists to think it's non-deterministic, or else they wouldn't have a job.