We will never know but AirRabbit's calm and persistent statements do make me inclined to believe that what he says may well be the reality of what caused the accident that fateful day.
The 'pitch up, roll off' characteristic of the B737 was well known. BA had a serious incident caused by this very phenomenon on take off out of Helsinki on a B737-200. It directly led to an increased speed procedure (possibly unique to BA), whose details I forget, in given conditions. The training captain who completed my training on the B737 was the co-pilot on the incident flight out of Helsinki and his description of the event when he related it to me in 1989 was as vivid and scary as it was when it occurred many years earlier.