in general there are 2 things that do not make sense for me with this "leak", its not about what he knows, its about what he was particularily vague on.
he knew the GPU clock speed while not knowing the CU count, how the hell would he have access to information to something that could easily be changed at every stage of the process, while the thing that would likely have been decided for a long time now, the CU count (because you know, size of the thing, BoM etc.), he does not know. pretty funny.
second was the ram. they have a dev kit and probably a target spec sheet, but only knows the ram of the development kit. lol.