Just because you can't determine what it will do doesn't mean that it's nondeterministic. You just don't have enough information about the hundreds of billions

Just because you can't determine what it will do doesn't mean that it's nondeterministic. You just don't have enough information about the hundreds of billions of radio sources scattered all throughout the galaxy. You probably don't have any better information about what the radio station a few kilohertz away will broadcast next, either.