he could, among other things, calculate the mappings in the mode
If the framework is isomorphic to QM, then it will make the same predictions that QM does. He may be just going along for the piggyback ride.
Is it a result, or is it a (not-true) perception of the underlying agent schema?
I think this is the first big challenge Hoffman faces - he has to show the mathematics of the larger true reality, and then show us how this hyper-reality produces us and the observable world.
The second is taking the model and making predictions that can be falsified.