This is just crazy. Getting 35s to fit on that Defender cost about half a gazillion dollars, and they still need to do some trimming. I bet it was also really tippy. While the traction-control on these is awesome, and it can keep moving forward with tires in the air, on a hard technical trail the lack of articulation in the suspension is really noticeable, and is super-sketchy.
I think the Grenadier would finish the Rubicon on its stock tires (31.7 inches in diameter), because it has solid axles, lockers (if you spec them), and good overall dimensions. However, it would spend a lot of time on its skid plates, and you would have a lot of dents and scratches. You would need rock sliders to avoid damaging the rocker panels and doors. Its possible that some of the undercarriage is not protected enough for this trail on stock tires, and you might do some real damage. No way I take mine on that trail with the stock rubber. Maybe on a true 33, but 35s seem to be the minimum tire size in order to keep damage limited to some dents and scratches on the skid plates.