AMD isn't claiming the RX 480 offers premium VR in the way you are suggesting, and in the interview with Linus, Raja was pretty clear, he is talking about Premium compared to stupid Google Cardboard, or other lame VR "Solutions" that use a smart phone as the display.
It's offering Premium VR with Oculus Rift type sets, clearly.
I don't see any other way to interpret it.
http://i65.tinypic.com/fyidr8.jpg
I think you missed his point.
There really are 2 (3?) tiers of VR currently, right? the carboard phone stuff, and the heavy lifters with Rift and Vive (and soon that Razr thing, right)?
No one that is investing in VR for their PC is going to be fooling with cardboard and cell phones. Here, the "premium" definition does seem to indicate a difference between those tiers, with Polaris targeted to qualify for that threshold.
In the image you posted, that clearly shows 480 falls within that premium tier, regardless of whether or not it performs as well as others. I think it's fair to say that they aren't arguing for a premium experience within "premium VR," but that they are going to get you to premium.
Maybe it's semantics and they hype that has been surrounding this up to release, but I think it's an accurate statement and AMD did deliver on that. That being said, those tests are sketchy at best right now and it's likewise difficult to predict where a mature Polaris will be performing for VR a year from now, and at what price: I predict a strong showing.
Everyone should want that. It means greater adoption and more content. It means that consoles running Polaris will have sets that can be called "PC Lite" when compared to Rift/Vive for a few years, and I don't see that as a bad thing.