Don't be angry at Dennis. He fouled, he accepted it, done.
Dennis complained very vocally while Wu had already got back to the table to the point that there was some fear that a "unsportsmanlike" was imminent .
The referee (John) was absolutely at the table the entire match. He was in a suit, and he was off and on camera throughout the match.
As a National Referee and Tournament Director, Ken Shuman is at the very least a proper consult. I can only imagine that John also called it immediately. These guys have been National Refs for a long time.