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'Spoiler' would be upright at the rear. What you circled is nominally a 'splitter'. Functionally, it lowers the stagnation point, forcing air up or to the sides instead of underneath.
So it depends on the relative merits of the streamlining the underbody as opposed to over the top.
If it were vertical it would be an air dam. Splitters are used to produce downforce at the front.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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