I think we are getting closer to the nub of the issue here regarding the non-award of the penalty when Rodri was being manhandled.
"VAR can be used to overturn a subjective decision if a "clear and obvious error" has been identified.
The referee will explain their decision to the VAR, and what they have seen.
If the evidence provided by the broadcast footage does not accord with what the referee believes they have seen, then the VAR can recommend an overturn." (my underlining & emphasis added)
https://www.premierleague.com/news/1297392
To my reading what this is saying is that unless the video footage differs from what the on-field referee
BELIEVES they have seen, then the VAR will not overturn.
In other words, it was all down to how Oliver described what he saw.......it does not mention whether the VAR would independently have drawn anything to his attention and asked for his view. If they didn't and simply failed to say anything then the decision was purely Oliver's alone. They would have had to have said "We think there was a penalty offence there - holding on a City player" and Oliver MUST have said, "Yes I saw it - just a coming together, not a penalty for me"(my words). Because if he didn't then either the VAR
failed to interpret that grappling as an offence (they would be in a minority) or Oliver
didn't see it, and if not,
why didn't he stop play and ask to consult the pitchside monitor?
This just reinforces for me the need to have the audio between the officials available because this reeks of potential for misuse.