This is just a silly discussion. I'm sure no-one is saying that incidents in the dying seconds of a game can't be checked for VAR. Of course they can, so VAR only comes into operation when the ball goes out of play. In the dying seconds of a match that is the full time whistle. So any incident...
Why get annoyed about technicalities. Play to the whistle. We deserved that, just switched off at the death. Went toe to toe with United, better team, chance after chance, but it didn't happen. Gutted but not going to blame the ref