How do you know the referee does see it?
I watched the match again on Man City for TV and just before the replay you see the ball go out for a throw in > then a close up of Oliver shaking his head and pointing to his ear piece > then the replay shows Oliver look at the player taking the corner kick > then Oliver looks at the huddle of players in the middle of the penalty area = thus Oliver doesn't see Aguero being pulled back by Rose and by the time he's turn his head to where the ball is, Rodri is already on the deck.
I'd post a video, but trying to control the Man City for TV app is difficult. This could all be avoided if referees were micked up for the whole world to hear what VAR is doing and what the referee and the other officials are saying to each other. If they saw both incidents and deemed them not to be fouls then that's one thing, but no one knows for certain. Football is a soap opera, decent sports like cricket and rugby have none of this controversy because we get to hear what the officials are saying, etc.
30 minutes it took to get the evidence below to help provide factual proof for my point. Life is too short, I'm off for my tea and going to think about whether my time this weekend would have been better watching the Ashes. Yesterday I decided to stay in the pub with my mates in the beer garden. I got to the ground at half time, and saw the second half. Why did I stay in the beer garden? Because, usually I put City first and others second, but I'm tired of doing that, especially when soap operas bore the hell out of me.