> PowerPC != Power, they are two different (though related) ISAs.

Starting with POWER3 (aka "PPC630"), the POWER microarchitecture has been implementing the PowerPC ISA. Thus, POWER3 through POWER7 is able to execute the full PowerPC instruction set.

http://en.wikipedia.org/wiki/IBM_POWER_microprocessors#POWER3
http://en.wikipedia.org/wiki/POWER3
http://en.wikipedia.org/wiki/PowerPC_600#PowerPC_630

> Therefore, it is fair to exclude Power7 from these discussions.

As shown above, it is not.

> you could change the claim to 'Fastest PPC code execution on
> consumer-grade hardware'.

Yes, that would be another possibility for him, besides the one I outlined already.