I don't think they were blacklisted--I'm sure that if next week AMD released a product that didn't need to be heavily spun in order to be looked upon favorably then they would absolutely source it to [H] and give them access. This isn't personal--AMD needs outlets like [H]ardOCP more than [H]ardOCP needs AMD (since they can always buy hardware should they need to so the worst case is that their reviews are published a few days later than everyone else) because AMD needs to reach the very community that reads sites like this in the first place in order to get sales. The fact that they are going for friendly journalists is a bad sign because it means that they don't feel confident that their product can stand up to impartial analysis and AMD has a history of doing this when their product launches are really troubled (Tunis as Kyle mentioned as well as Tahoe on the Phenom side).
[H] is pretty much the only ones who didn't get an invite. Even Linus was invited.