aside from the camera angle making the grade seem much steeper than it was noticeable by how much the front of the jeep dropped just as he was disembarking from the final rock. Still the grade must have been greater than 30 ° possibly approaching 40° at times. A 30 ° slope translates to a 60% grade pretty much the limit on most off road vehicles ability to climb or descend without the assistance of being wedged in a grove such as the tires were on the jeep even being wedged an 85% grade (40°) would be a feat nearing on impossibility. I said nearing the impossible, as there are several rock crawlers with documented proof to not only descending but ascending grades well above 173% (60°) angles for short distances.
All and all I say this guy is a genuine rock crawler