Not a big jet pilot so don't know the answer but if there was so much weight shift as to cause a major nose up and stall, then how; with barely minimum flying speed, did they get the nose back down below the horizontal ?
Just asking; but if the weight of those vehicles had moved very far back, wouldn't the crash have looked more like an SU-27 doing a tail slide ?
It looks like if they had another 1000 feet the outcome may have been different - that doesn't strike me as an unrecoverable "out of CG" problem.