Hang on a minute:
"During testing the benefits were apparent, though. Even when the actual round-trip time between input and server response was 256 ms, double-blind testers reported both the gameplay responsiveness and graphical quality of the DeLorean system were comparable to a locally played version of the game."
Gameplay responsiveness, sure, but... graphical quality? If I was testing a system like this, I'd be asking about that as a way to identify people who were just agreeing it was better because they thought it was what I wanted to hear. Graphical quality should not be affected by how quickly the streamed game can respond. There's something fishy about this.