Well, I don't know if you are in any way associated with "Crow" or whatever this dude chooses to call himself, but don't let the lousy remarks of the people on that particular site get your goat. Some of that stuff is kinda tricky to land comfortably...much respect for climbing all the 5 steppers. That can be difficult to do and keep momentum, let alone do so many in a row.
I read the remarks of the people below the vid...I think it's fine to do urban riding on a dual suspension ride. Have you seen 'Jib'? There's some urban stuff on that vid that I'd only do on a dually.
I did however find his choice of dual susser kind of odd for doing 5-footer's (or so) to flat concrete. Was that a Jamis Dakar XLT? Those are designed for all mountain / aggressive XC stuff. That thing won't hold up forever if he keeps dropping to flat like that. Premature wear is inevitable. He should go with a more heavy duty'ish bike like a Session or Gemini or something.