I really hope he's not over hyping, I want this to be the actual hype levels!
I've seen his posts there for a while. He's usually pretty laid back an devoid of hype. He's been on record as saying that FFXV is the first game (might have been second) that he worked on that he's also going to play. He's really high on FFXV.
That quote was from a thread about the trailer, and specifically Tabata's claim that the new trailer would blow our minds (paraphrased). The thread creator, and myself, both were pretty skeptical that it would beat the E3 2013 trailer. That's when Spiro came in and took over the thread.
Basically, go ahead and believe the hype. He's usually pretty damn level headed.