You are right. He could put a wall mounted flag on the outside of his home. The flag sconce takes the pole ( it slides in)and holds it at an angle. He is allowed 2 of them
according to the zoning law you posted.
and the flag pole too.
also it is not a zoning law. It is a state wide statute that PREEMPTS any zoning restriction. (like the feds preepted the small satelite dish bans.)