I completely disagree.
I think it will do quite well offroad. I've seen many a Sidekick wheeling, and those had way less torque than that diesel will have. They never had any more issue that a stock first gen 4runner.
Is it going up Chinamans or the like in bone stock form? probably not. But certainly I could drive that over Mosquito Pass. I'd have to work it in a few spots, but not much.
Plus, traction control goes a long way.
A good driver could likely take that thing up a number of medium trails without trouble, assuming you swapped on some decent tires.
Baby Beast 2- 1999 4Runner SR5
Baby Beast -1987 4Runner SR5-Gone, but not forgotten