According to the tech (Paul) he was locked in 2nd gear (autostick 2nd gear set). He then ran up to just under 2,000 RPM and hit the gas full to redline.
I don't believe he 'mashed' the pedal or it probably would have downshifted. I don't know.

I can try the same thing on the street 'mash' and not 'mash' and see if it downshifts or not.

I will say this... it's WILD to hear that V6 with a Super Charger hitting 6,000 RPM... WOW!