It took awhile to go through all this.
I'm thinking a bad batch of rims or improperly tightened spokes.
I help BMW with their offroad demo program and we beat the crap out of these bikes and no failures.We run lower pressures because we have new riders and want the best traction and I can say we have whacked some fairly large rocks at speed with no damage.
In 30 plus years of off road riding I've bent a few rims but no where near as bad as those photos, thats some bad damage.
I have bent rims on my R1100S though.
I would think BMW would step up to the plate on this, shite happens.