This is the part that can be emulated in software. All you have to prove is that what ever platform/language you're using for the programming is Turing Complete, which is the case for almost all of the most popular languages.
So can I run Crysis on my TI calculator? I'm sure whatever platform/language is running on it is Turing Complete. I think you missed the point that the brain is also hardware.
Good point, I'm assuming their Nvidia GPUs have enough power/memory to do the processing they want to do.