John, as usual, is full of shit.
There are more than one RISC based architectures. ARM is one, Power PC was another, SPARC and Alpha were also RISC. The thing in the SENS cartridge might have been RISC based, but had nothing to do with ARM being used in the iPhone. By the time the iPhone came out ARM based CPUs including ones from qualcomm, Intel (xscale) and TI had already been in RIM/Blackberry mobile devices and Windows Mobile and were fairly mature things. The other thing is that this Super FX chip was not used as a general purpose CPU. It was configured to do one thing: pump out graphics quickly, kind of like a FPGA is sometimes used for signal processing or what not. It's more akin to a modern GPU than a CPU. Additionally, unlike a mobile phone, it was always connected to a console while in use, which was powered from an AC outlet, so despite being small, as John mentions, it didn't have any of the power limitations that something designed for mobile would.
John is a fucking moron.