Wow, that's impressive.
Sure a belt drive can handle torque/ backpedaling no doubt. But a point to keep in mind though is, motorcycle belts are never put through the stresses of abruptly having the powertrain stop entirely during a skid in a snapping motion, then withstanding the inertia of the rear wheel pulling back and the weight/ power of the person pulling forward, often times in quick succession.
Not to mention, motorcycle belts are wider and beefier by design.