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all true. also, it might help to explain the difference between a wing and a spoiler. a wing is used to actually create downforce. a spoiler is used to reduce the lift generated by the shape of the car itself.
if you think about the car in simplified form, the bottom is flat and the top is curved. air must follow a longer path to get over the car than to go under it. this means that air flowing over the car must move faster than the air flowing beneath it; the bernoulli effect causes the low pressure area above the car responsible for the lift. to reduce this lift, we can EITHER reduce the speed of the air moving over the car, or increase the speed of the air moving beneath it. a spoiler does the former. venturi tunnels under downforce cars do the latter.
in effect, the spoiler on our car is used to simply interrupt the flow of air moving over the car to slow it down relative to the air moving under the car. once this happens, the pressures above and beneath are closer and lift is reduced.
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