I'm thinking it's real too. I would discuss my feelings towards the unrevealed characters in the CSS picture, but I'll summarize it in one word: "meh"
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I'm going to say that it's more than likely real, at this point. I find it hard to believe that someone would go through so much effort to fake all those elaborate trophies and video footage. However, I remain open to the possibility that some parts may not be entirely real, or that the roster is incomplete.