[....]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.
It seems that Garnacho goal was disputed again by Ten Hag in front of the media. But it sounded like he wasn't admitting defeat. Whether it's Offside or not, the referee's decision is final and Arsenal has won the match. Regarding VAR, we already know that in every match there will always be something that doesn't fit, maybe the Man United fans don't accept this crushing defeat. Very disappointing of course, but to be honest, I think Arsenal mentality is better and they can turn things around quickly, They used the last minutes in an extraordinary way.