As @goatman2 said, the Porsche has traction control to apply the brakes to tires with less traction to divert power to the tires with more traction.
The Porsche electronics are tuned for off road when you engage 4L. Throttle becomes less sensitive and traction control becomes more aggressive. If you have the active sway bar, it disengages.
He may have had rear locker, couldn't tell from the bits of the video I watched. With 4WD (center locked) and rear locker, you have 3 corners to find traction. Independent suspension, especially front+rear like the Porsche and new Defender, will lift tires. Lockers are essential at that point.
With a beam (solid) axle, as one end is pushed up, the other side is being pushed down. That gives you twice the amount of tire to spread the weight of the vehicle on, increasing the total area of the contact patch and friction.
Slick rock in Moab, although I've never been, is reported to be a high-traction surface.
As for comparison to the Bronco, I've only taken my Badlands Sasquatch out twice and haven't had the time to do a test of the traction control system. It would be great to see how the parameters change between Mud/Ruts and Rock Crawl goat modes, 4H and 4L, etc.
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