"Unlike some, I don't blame AMD's Jaguar for that: AMD has variants of the core clocked at 2GHz and above, albeit at higher power consumptions. Microsoft or Sony could've specced out a variant of the core clocked at 2-2.4GHz and boosted total CPU throughput by as much as 50%. They didn't. "
CPU limited doesn't mean GFLOP limited. Most AI systems are GB/s limited, with small memory footprints that can be in L1/L2 cache. Most likely Ubisoft's methods are crossing the L2 barrior more often than they would on conventional desktop CPUs due to poor chip design rather than not being able to actually implement a good algorithm. Both companies should have stuck to IBM or Intel for the chips, since both are more energy efficient when limited by something other than gflops.
"The programmable nature of the GCN architecture inside the Xbone and PS4 is meant to compensate for the relatively lightweight core"
And AMD's driver implementation means you can't compensate for anything due to horrible OpenCL complience. Few AI kernels would be able to be properly compiled for AMD chips, and if the AI is as complex as they claim it certainly won't work!