I figured as much. So whoever develops a 50-qubit quantum computer first (Google?) will have to prove that the same simulation can't be done with a supercompute

I figured as much. So whoever develops a 50-qubit quantum computer first (Google?) will have to prove that the same simulation can't be done with a supercomputer. And they'd need to be serious about it and use the latest research in classical simulation, including IBM's 56-qubit research to try and do it on a supercomputer. Otherwise, they may claim "quantum supremacy" and 3 months later someone else will prove that the same simulation can be done on a classical computer.