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It's far, far better than a roof rack.
If the bike's tires extend past the sides of the vehicle, then it's worse than not having anything at all back there. In fact, even if the tires only approach the sides of the vehicle, it'll be worse than nothing.
That rear spoiler will help if extends the downward "taper" of the roof line at the rear (should be easy to eyeball). If there's no obvious downward taper, it may still help, but only careful testing would confirm. Regardless, it would not undo the effect of having the bike's tires extend wider than the rear of the vehicle though.
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