Do Nintendo usually show the press their E3 videos in advance? Seems a little strange this random guy in France is commenting on something yet to come.
Even if he has seen it, I bet Nintendo have withheld some big stuff until the official broadcast.
Only thing we have as reference is them showing Starfox to select press before the Digital Event last year. I've not heard of anyone being given the Digital Event to watch beforehand. They know that leaks would happen.