I agree with you....
however, G5Unit IS using a G5 enabled mac, which is probably the hottest (yes, in both senses of the word), sexiest, and absolute best processor in the universe!
You could just say 'G5' Mac. It's a bit like me saying 'a movement-enabled car' (why do analogies always end up being about cars?).
And no, the G5 family are not the hottest processors in the world. MHz > speed they come out as THE most inefficient PowerPC chips made. A single 1.5 GHz G4 would give a single 1.8 GHz G5 a run for it's money, if not a beating. A 2.0 GHz MacBook Pro outruns a dual 2.5 GHz PowerMac at compiling XCode projects by almost double.
So in short, no the G5s were by far not the hottest chips made.
However, the G5 Macs were great machines, and are the fastest PPC Macs ever made.