Magplug: no. At normal approach speeds (and I feel this 80 was in a slower flt regime at the time, due to the large amount of nose-up stab exhibited by the fin), there is simply not enough control authority or pitch-rate in the '80 to overstress it to failure. It has manual flt controls via tabs, and flies very sluggishly on approach compared to more modern PFCU-type aircraft. I don't believe this a/c broke up prior to ground impact. The aircraft would be more likely to depart if you pulled very hard at approach speed (thru' the pusher) than break up.
Clean min. manvr speed and above - different story.