no, actually down force from ground effects requires the vehicle to be on the ground. this is why when a car moving at a high rate of speed gets to much air under the front bumper the car can flip … the “ground effects” become nothing more then added weight, and in all reality they can help the car get MORE air because they TRAP air under the car (low rocker panels, limited rear airflow)
and the reap spoiler wouldn’t have created much lift either, due to the turbulent air bouncing off the taillights of the car
what happened here is that the car simply flew like a flat piece of wood being knocked off a table hard
the only reason this car flew is because the ground wasn’t level, the edge of the track was banked, and then the ground dropped down from there