It would seem that. if the speed of 90kts was true, they must have been very close to a full stall, certainly past stick shaker I would have thought. If this speed was caused by a sevree pull up then I expect there was quite some g-loading. The more learned bretheren amongst us could elaborate. I'm curious as to whether the elevator would have enough influence to affect a nose over recovery. If so, there must have been 'lots of stuff' floating around the cabin ceiling. If not, would some roll habe been required to recover this beast. I would have expected the elevator to have been as useful as wet fish at this speed.
Were there any eye -witnesses, or were they IMC? I've not read all earlier posts to note the Wx or time of day. If not, the subsequent aeros must have been entertaining to the locals who have their fair share of summer inverted antics along the beach front.