'ELEVATOR trim stall' is an FAA concoction
Pug, I'm not sure of what you are referring to here. The only "trim stall" that I'm familiar with is stabiliser trim motor stall when airspeed is so high that the trim motor is unable to counter the aerodynamic loads associated with an out of trim condition.
" We are all apprentices in a craft where no one ever becomes a master." - Ernest Hemingway