It seems logical we would be exactly that. This is how we would evolve during natural selection. It all makes sense. What reason would there be to be otherwise? It seems like human, wishful thinking to me that we are more than this. Since people want to think they are more than advanced automaton it is likely that this theory is based on imaginary foundation.
The system is complex, but I would argue against it being unknowable. We do not know all the details right now, but it is possible we will know them in the future.
> What we don't know is infinitely larger than what we do know.
Yes, but that unknown, by your own description is infinitely larger than us as individuals, who have a limited time and space of existence.
Unless you want to argue for a fictional contract between human existence and a "universal" or divine purpose (as most spiritual or religious systems do), the infinite unknowns don't pertain at all to the question of whether we are just very advanced automatons.
I didn't encounter that concept, so I don't know. That said, I'd argue these are unknown unknowns, but they're not unknowable in principle (except perhaps in areas where incompleteness theorem applies).
What we don't know is infinitely larger than what we do know.