I don't think so. VAR will review a goal regardless, but they can only do that if the ball is in play when the goal is scored. If a whistle goes before the ball is in the goal because the lino flagged, play is dead and the goal can't stand.
Consequently, the only instruction for offsides is if...
The Liverpool/Forest one wasn't onside. It wasn't even close. There needs to be two defending players between the goal and the attacker when the ball is played. Usually it's the keeper and one defender, but as you say Alisson was in the Forest half, so for him to be onside there needs to be two...
Yes for me. Bernardo makes the most of it, but the leg is hanging out there, blocking his path.
Should VAR have given it is another question. According to the guardian live feed:
Penalty for Manchester City! There’s a lengthy, protracted VAR check going on at the Etihad Stadium after an...