I just realized why that is. I was confused for a sec but all is well now
Our ATTESA system is such that the 4 wheels are powered equally until about 18mph. Then the system sends 100% power to the rear unless slippage is detected. I was surprised to see in this video, on a AWD Dyno, that slippage was obviously detected as the front wheels are being powered past 18mph - at the same speed as the rear. I expected to see the front wheels powering down, but then I realized that if they did that, the system would have detected a difference in speed between the front and rear, and would power the front wheels (slippage would have been detected) - or stop the rear wheels. My bad - this video is normal
But there is something else: did you notice the slight delay before the front wheels engage? You can balrely see it but it is there. There is another video that shows the same thing, a slight delay before the front wheels engage. Seems odd that the delay, while short, is still relatively long...
No biggy, just an interesting observation.