Here;s a diagram of how it worked, for interest.
That's what I thought too, but it's not conventionally possible with the Hummer's current motor setup. Rivian has a motor at each wheel, which is what makes Tank Turn possible. Hummer maxes out at 3 motors. They could theoretically make some kind of differential that splits the torque between the front wheels and sends them different directions when Crab Mode is engaged, but that seems too complex to attempt, especially for an off-roader.That seems way too elaborate for a production model. My guess is that it will be more similar to the Rivian's tank turn.