He didn’t blow though. He had the whistle in his mouth but carried on running as if play was continuing. He never blew the whistle, none of the players stopped playing or reacted to a whistle at all. There was no whistle picked up by Sky either.
Maybe he fucked up his hand signals then shat himself.
Just because they didn't pick up the audio doesn't mean he didn't blow.
Either way, he didn't signal for advantage. I think he just got caught in two minds as to what was the best way to fuck us over and if he could squeeze it into a red for Emerson and in the end it was too much information for his head to process at one time and he made no decision.
VAR would have pulled it back for the moving ball/double touch anyway because he didn't play advantage.