also of note: "The Arm ecosystem continues to grow, with Arm partners signing a record 175 new licenses in calendar year (CY) 2020, bringing the annual total to 1,910 licenses and 530 licensees."
It's definitely an MT7688 on the Omega2, not an AR9331. I updated our post at HackerBoards this morning, and added a pair of detailed block diagrams of the MT7688, showing two modes of its operation.