I think it's turbo, just like Minacious is saying you can hear it in the beginning, and I thought it was pretty obvious why you can't hear through the rest of the video because whoever is driving never even gets close to giving it full throttle, and since rcsti pointed out it uses small turbos then it's going to be even harder to hear any spooling. And it is just as noticeable with a diverter valve as it is with a blow-off valve, just a different sound.
Point is: yes it sounds turbo at the beginning but he never gets on it after that, so it doesn't show was the APS TT can supposedly do.
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