Is HBrO2 a reductor?
If you need a good answer, you should not put an information embargo on the context of your question.

This is to be taken rather as an expanded comment than a full answer:
$\ce{HBrO2}$ oxidizes $\ce{Br-}$ to $\ce{Br2}$.
$$\ce{HBrO2 + 3 Br- + 3 H+ -&gt; 2 Br2 + 2 H2O}$$
To tell if it may compete with $\ce{Br-}$ to react with the &quot;chemical&quot;, we would have to know that chemical.
Regarding standard redox potentials, an exhaustive list is on Wikipedia, but $\ce{Br^{III}}$ species are not there.
But be aware $\ce{HBrO2}$ is unstable, strong oxidizer, while $\ce{Br-}$ is a weak reducer. I personally think the info may have been misinterpreted, having meaning $\ce{HBrO2}$ may compete with the chemical to react with $\ce{Br-}$.