I am not aware I wrote that metal fatigue or general wear and tear was the cause of this accident. It may have been a contributing factor.
I do believe the bit that detached from the aircraft, shown in the security camera footage was bigger than an engine cowl. I believe it was a TE flap or part of.
What I am sure happened is the crew lost control of the aircraft. that is self evident. Why? Who knows but low speed would have entered the equation. Judging from the film clip the stabilizer was still intact before it hit the ground. whether they had any use out of it may have been another matter.
All speculation, nothing more.