That Numark looks pretty damn close! But you are right about the placement of the EQ sliders (sliders, not knobs). I didn't notice where they were in the video until you mentioned that.
I'm thinking it has to be a Numark now with those knobs at the bottom, because the one time you see David using the giant potentiometer at the bottom of the mixer, he turns it all the way around right after he's mixed in another track. That would make perfect sense if it was a headphone potentiometer like on the Numarks!
I love these old MTV clips, they really are amazing. There's a great Facebook group for former Club MTV dancers, who were a bunch of Long Island kids with some amazing fashion. One of them is now a Real Housewife on Bravo, if you can believe it!