SenjutsuSage is likely referring to all the interesting conversation happening at B3D at the moment, since he's an active member over there. Even ignoring the upgrade rumors, you have people like Dave Baumann coming in with statements like: "I would wager, that when the ESRAM is used effectively, the performance of the Xbox One's graphics subsystem will far an away outstrip any of those discrete parts you mention." (the discrete parts in question being 7770 GHz Edition and 7790, a 1.28 TFLOPS GPU and a 1.79 TFLOPS GPU respectively).
It's great that you have a background in computer graphics, but from first-hand experience I know that doesn't necessarily make you an authority in this case. I also have a degree in Electrical Engineering from a prestigious university, with my master's thesis being from the field of computer graphics, but that still doesn't mean much - my knowledge of modern computer architectures is nevertheless too limited, and the data that is available to us is insufficient. As your peer, I cannot agree with you, we (together with people with far more authority, judging by conversations at B3D and elsewhere) just don't have enough information to be making such definitive statements at the moment.
And making claims like
is certainly not helping your cause; real-time 3D graphics, as opposed to offline 3D rendering, are all about faking as many things as possible in order to achieve better performance and perceived quality while retaining a high enough level of believability.