The film
The edit opens and closes on a grey photo collage. Two of its three tiles are the real photos the film started from. Between them, every scene was generated: the garage walk and pillar lean, a fisheye squat and a palm pressed toward the lens inside the stair tower, and a climb to the tower's top landing.
How I checked it
I read the reference frame by frame before generating anything, then checked each generated clip for likeness, hands, and outfit before it went into the cut. The finished edit passed a motion comparison against the reference on cut rate, flashes, shake, and camera movement.