"Guiones, forgive me, but you lose autotrim, which makes quite a difference!
If you use full thrust then idle power etc...the plane cannont be controlled by the sidestick (elevator lacks authority if you do not manually use the trim wheel...and on the A320 that is not a reflex action)
No regular airplane there if you have not said during briefing prior to those manoeuvers "we shall lose autotrim, I will use the trim wheel to control attitude...)"
Narval, what the heck do you fly; anyone that flies Airbus FBW knows that during DIRECT LAW you will loose AUTO TRIM and there is a big anouncement in amber right in front of you to remaind you. Regular airplanes do not have auto trim !!!
The main point you are missing is the test was for protections related to NORMAL LAW, as soon as the A/C went to AlTERNATE LAW the test should have been discontinued; without mentioning again the altitude at which it was perfomed.
G