blips
"There is no evidence that the pilot’s yoke trim switch failed to work any time that it was used."
Oh contraire, there is more than sufficient evidence to demonstrate that, on the balance of probability, the trim system was unable to overcome (in the ANU moment) the AND aerodynamic forces present at that time.
You are more than welcome to dispute this conclusion of course, but you must be prepared to challenge numerous experts from multiple CAA's around the world in order to do so in any meaningful way. Until that occurs, the aircraft is grounded indefinitely.