All good
I'm afraid you got this wrong. The protocol is very specific to stop this from happening. VAR can not tell the referee to review because in the VAR's opinion a decision was wrong. They can only ask for a review if the decision was "clearly and obviously wrong". It can't be in the grey area. It has to be black and white. Or in other words just about every referee at the same level has to think the decision was wrong. This gives the VAR the confidence that once referee sees this, he will change his mind because it's very black and white.
Once the referee is over, the referee doesn't review the VAR's opinion. They review their own original decision. And at that point there is not clear and obvious criteria. They basically ask themselves, was I wrong in my original decision.
I suspect they do as part of match reviews. To make a point, if out of 10, 8 of them think it was SFP and 2 think it wasn't then it was the right decision not to review. Simply because the 8-2 split means it's not clear and obvious.
I must add, even though the protocol is very solid, the referees, especially at EPL get it wrong very frequently. Proven by a survey done a couple of months ago more that 40 reviews or non-reviews were wrong.