I get it if the fact the ball goes out actually influenced the goal - like a cross that went out, or a player dribbling past another by taking it out and then scoring - but it had no impact on the actual goal - we didnt gain any form of advantage from it.
If a player had pulled another player down in that break - they would have been booked - and that would of stood. VAR has been appointed. Anyone who campaigned for it to be introduced never thought - oh great this will protect against all the goals where a a ball may have got out by the attacking teams own corner flag, and the cheating bastards go on to have a couple of shots 20 seconds later and one of them goes in.