The video in question from what I can see and from the sequence of pilot/instructor inputs shows recovery technique for an "Overbank".
Such recovery from overbank is part of the advanced theoretical syllabus in Fcl.745 where it is described but not to be practiced as an upset.
Few schools train the maneuver, APS is one of them.
The extended UPRT training syllabus offered by APS, is based on the precept that in case of an emergency one does not raise to the level of expectations, but rather sinks to the level of one's training.
Over 90 degrees of bank the wrong recovery technique due to untrained instinctive reaction (Pulling on the stick) will have disastrous consequences;
The" lift vector" in an arcraft trimmed for straight and level (1g) when passed 90 degrees is pointing downwards towards the ground below,
The video shows the simulation of the upset, in correct sequence, first quickly positionning by half roll past 90 degrees to inverted
Pausing for a moment when inverted ( recognising the situation), due to "Lift vector" set for normal flight at 1g here the nose is already pointing to the earth below.
Then the instructor "Freezes " the maneuver for a second to emphasize the necessity to "Push" on the stick to reverse the "Lift vector" now pointing towards the sky, introducing a slight negative load -1G
Next in the sequence is the rolling towards the "nearest" sky to complete the maneuver
Note the repetition of the maneuver over and over to achieve consistency a prerequisite for proficiency , situational awareness and acquaintance to extreme attitudes.