The poem says aḥmari ʿĀd; whom does the commentary identify?

Zuhayr ibn Abī Sulmā: War, the Grinding Mill, and the She-Camel Metaphors (Verses 28–32)

• A peacemaker of ʿAbs
• The killer of the she-camel of Thamūd
• An Iraqi tax collector
• A rider in Imruʾ al-Qays