Yeah, that's definitely a D-series you can tell by the SOHC head and downdraft throttle body.

Although it's interesting why he'd put a D16 in that car, they're a much lighter block, so if he's tuned it out it might be a fun set-up. I wouldn't knock it just because it's a D-series. That's the major complaint I have about the integra is the weight distribution, or lack thereof. Maybe his philosophy for tuning the car was to find a lighter power/drivetrain set-up and lighten the crap out of the rest of the car, then again the battery is still in the engine compartment which is one of the first things I would change.