The argument is about quantum indeterminacy. The wiki page for is covered with 'we don't understand why we get random results', and a lot less covered with 'we get random results because that's how quantum mechanics work'.
That's how I feel exactly, and why I hold the belief that nothing is random. We perceive it as random because we don't understand it, or why it produces results with no ostensible pattern. That doesn't mean there isn't a mysterious fifth force that we haven't seen yet, or perhaps a Fixion particle we haven't discovered yet.