Unfortunately, I knew it was fake the instant I read about XDR2. AMD would shot themselves in the feet by making such a deal with Rambus. Oh, and there will be no 28nm high-end parts this year,
As a sidenote, it would be not that great of an improvement even if it were real TBH, which ironically made them a bit more reliable even dreaming about XDR2. Some hardware areas - if not most of them - are crawling compared to how fast they advanced in the late 90's to mid 00's. There is simply not much demand for more, outside of portables, and some obvious physical restrictions.
Moore's law is going to shit and most manufactures, mainly Intel, do not admit so, in order to please shareholders and blind them to the obvious issues they are going to face very soon. Do not be surprised to see hardware manufactures defending some kind of killswitch the way developers are moaning about used games, a few years from now.