I haven't tried any launch on my SQ5 TFSI, but I get the impression it's just a brake torque launch. Isn't the process just traction control off, manual mode, mash brake, mash accelerator (torqueing against brakes) and go? Since there is no DSG, the transmission doesn't have a way to be neutral and "drop the clutch" so to speak. I would guess doing this with the torque converter transmission is not good for it but hey, historically they're stout. My dad used to tell me about brake torque launching V8s in the late 60s and said they never nuked any of them doing it.
SQ5 in Phantom Black