The mistake he made was putting the nut back in the same place. You can do what he attempted, but once the nut is removed, you must tighten it a little past where it was in order to put a little preload on the old crush sleeve again, or it will loosen back up as yours did. I have done lots of them like that and never had a problem.
Although it is better to use a new crush sleeve or an eliminator......but it CAN be done like he was trying to do.