The physics of our brains can in principle be simulated at a subatomic quantum level mathematically, even on a classical computer. It would be absurdly expensive and slow with current technology, but it is mathematically possible. Therefore our own generally intelligent brains can be considered a counterexample.

I think for your theory to hold up, you would need to show that physics cannot, even in principle, be simulated mathematically at sufficient scale (the number of interacting subatomic particles). That would be surprising.

At the moment it seems like your results contradict reality, meaning your starting assumptions cannot all be true.