A presentation is a presentation - it's hard to present and do a good job of it, so I'm fine if they use videos for it. However, if I get that machine and it doesn't do what you claim it does, then expect trouble.
Surely, someone like Intel should be able to simply rig up an identical machine in their stand that is really playing the game, and either let the public play it, or have someone playing it live? The presentation might be faked, but even the laziest journalist would see it for real when doing even the most basic of checks on the story. Seems as much a PR fail as anything else.