Some of Andrew's designs use wings rather than underbody aero to create downforce. This is probably due to production based unibody cars that are constrained by rules not being able to offer platform control like a bespoke racing chassis.
Platform control is important for the consistent performance of underbody rear aero. Too much body motion can affect underbody airflow greatly causing the rear aero to lose effectiveness. A similar strategy was applied to the ill-fated Team America R32.
This is a better-executed variant of the exhaust air handling theme of the Team America car. This reduces drag by moving air from a high to a low-pressure area and ensures adequate ventilation of the engine compartment and various heat exchangers at speed.
The wing mounts are adjustable for angle and the entire wing can be quickly removed with quick release clevis pins. There is not a whole lot of stuff going on the back of the car because much of the stuff usually found in the rear trunk area has been relocated to the car's passenger side bay and the 'Freedom Tunnel” also takes up a lot of space in the area.