Are you sure about that ?
The BEA Note tells us that it took the 30s continuous NU Input to get the THS from 3 to 13°.
Where did you find evidence that it followed suite to every Elevator input ?
+1
I, for one, do not believe that is how the THS works. Otherwise every small SS input would result in a re-trimed aircraft (even though it would be a small change).