Not had mine in snow, but in loose sand, the ABLS works great. Even steep dunes are no match. The slip light flashes, and you can hear the brakes chattering to transfer power, and the vehicle never loses momentum. I have the VDC turned OFF when off-roading.

Those that don't think their ABLS is working, have you looked at the tires on BOTH sides to see if they are spinning also?

Looked to me in the video that the tires on the passenger side were in deep snow with no hope of traction. The ABLS transferred power to the driver's side, but the road was icey. If the road had been dry, it "might" have dragged itself out. Being that stuck, and with the belly of the SUV in packed snow, SOL at that point. Don't think lockers would have bought you much at that point either.