If he was found off of Water Street SW then he was really found, in the Washington Channel and not in the Potomac proper. They should have reported a body recovered near the Washington Marina or near the Titanic Monument or given a more precise location than “the Potomac River”.
I guess they would report that Wilbur Mills fell into the Potomac but at the time it was reported correctly that he was splashing around in the Tidal Basin. Well it is all connected.