I think if you wore it low on your hips and paired it with a blousy top it actually hides a tummy, if you used it right around your wait it might accentuate it.
i think it might depend on the shirt you're wearing. the shirt can show off your rolls if its tighter... i would probably wear a looser, dark colored shirt with a belt like that.
Did you see the latest lucky? They featured some looks to hide a tummy pooch and one of them involved a tunic and skinny jeans with a low-slung belt...
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"Anyone who lives within their means suffers from a lack of imagination" - Oscar Wilde