Probably not, IMHO.
The wake of that device dies at the stagnation point.
Compare the Herrod's Helper, a similar shape mounted below the back window of a VW Beetle. By shaping the wake of the whole car, it had some positive effect.
ecomodder.com/.../old-school-original-vw-beetle-aeromods-herrod-helper-7444.html
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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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