We took our Defender to an OHV park here in CA over the weekend, and climbed a manufacturerd obstacle that was made up of concrete steps that were covered in fine, loose sand. We were in the mud/ruts program, which allows moderate wheel spin, and yet we slowly and deliberately crawled up the obstacle, with some wheel spin, but it was always slow, and all the tires were spinning, as the car slid side to side looking for traction.
The wheels never spun fast like the car from the Denver dealer has done in videos. That further convinced me that they are in the wrong mode - possibly trying to over-compensate for the lack of a rear locker on their rig (something my rig has).
Bonus: after we climbed the obstacle with minimal fuss, a lifted Cherokee XJ with huge mud terrains tried to climb it, and his wheels were spinning all over the place. He could not climb the obstacle, even using tons of momentum. If we were Youtubers, I would have been tempted to post a video with a clickbait title about how Jeeps are crap off road and the Defender destroyed it ?
I wouldn't have actually done that, mind you, because I'm not a petty child... but I would have been tempted.