I don't really disagree. Just because there's a potential conflict of interest doesn't mean there's corruption. And the further you get from large companies with internal audit teams and established procurement practices the fewer controls there are the murkier things can get.
Per the peer comment, if you don't disclose the conflict, and let the BoD decide what to do in light of that conflict, then you're into the realm of looking like you're hiding something.
It's the principal/agent problem. If the director is an agent of the shareholders then conflict of interest IS corruption unless you have some sort of safeguard to stop it affecting your behaviour.
Per the peer comment, if you don't disclose the conflict, and let the BoD decide what to do in light of that conflict, then you're into the realm of looking like you're hiding something.