The point is, you don't need to fix every game. Liverpool will beat a majority of teams this season; as will City. If there is a gap between the teams at the top, as long as they both keep winning there will be no need to manipulate the results as long as your favoured team remains at the top.
If Liverpool are comfortably winning by 3 goals with 10 minutes to go, I could easily imagine them getting a VAR shocker against them, just to prove decisions 'even themselves out' over the season. Conversely, if they are loosing/drawing with 5 minutes to go, the odd's of them getting one in their favour will be astronomically high.
We were drawing with Spurs, but VAR was used to chalk off a legitimate goal (the correct interpretation of the handball new rule) in the last few minutes of the game, thus opening up a 2 point gap with only 3 games gone. The fact we didn't take our chances is beside the point. VAR had an opportunity to manipulate the result, and it appears they took it.