[....]I also don't know for sure whether the VAR decision for the goal scored by Garnacho was correct or not because after that incident it was Arsenal who managed to turn things around.
What are you trying to say here? Arsenal's last two goals has nothing to do with the disallowed MU goal. If you have a problem with the call then point it out on a technical level and not come of as someone saying MU was robbed of that goal so Arsenal could win. Garnacho was offside by the slightest of margins.
I will not blame some people for making sentimental judgement and statement about Manchester United cancelled goal in the last match this is because such comments are born out of a shared mindset as being a fan of the club.
But while they are at that, the reality still remains that that goal was an error goal according to the evidence and statistics so let us just forget about prejudice due to affiliation instead of using facts.