Well I think people might misunderstand the tech, obviously the CPU is more modern, and not optimized for the engines being used, prophecy's contact is a complete unknown as well, he could be someone not familiar with different IBM processors, or he could be a plain numbers guy.
Wsippel has estimated the Wii U's CPU to be based on the 470s series and has mentioned that those chips don't support SIMD, but there was one that did, the 476fp, which if Wsippel is right, would give Wii U a CPU that is "3 cores" but 6 threads, @ 1.6GHz-2GHz Out of order, it would be faster than Xenon, but you would definitely have to optimize to really see that, but in no way is that a weak CPU, it's simply different, and depending on the clock speed, could in fact compare favorably to a steamroll "4 core" since it's easy to describe that cpu as a dual core with "hardware hyperthreading" Just look to Bulldozer if you need to know what I'm talking about there.