Wasn't it only one of those CPU's though? He mentioned there is a CPU dedicated to disk operation and that's the one no one had been able to get a ROM dump of, which in turn enabled all the other stuff? Not trying to downplay his achievement or anything, I'm new to all this but it's easy to see that this is some truly amazing work.
2 CPUs, 2 GPUs, and there is a separate CPU dedicated to disk operation which was (almost) completely isolated. His achievement was getting access to that disk CPU, but that access allows access to the rest of the CPUs.
