Your information is outdated my friend.
RSX is not clocked at 550 (which it was advertised) but at 500 so it only has 68billion
Xenos has 48 shaders and 4 ops per cycle so 48 shader units * 4 ops per cycle = 192 shader ops per clock (compared to RSX 136.8)
Xenos is clocked at 500MHZ *192 shader ops per clock = 96 billion shader ops per second.
I think you missed something there.
"On chip, the shaders are organized in three SIMD engines with 16 processors per unit, for a total of 48 shaders. Each of these shaders is comprised of four ALUs that can execute a single operation per cycle, so that each shader unit can execute four floating-point ops per cycle."
That was from ATI. I am not sure, but I don't think you can support you case by quoting from Heavnly sword devs, unless they are backed with numbers. I don't think I can accept a sentence starting with "Ironincally for Xbox360 fanboys" as an academic conclusion than just a mere publicity stunt.