It's frustrating that Pod was shown to be in an offside position, no-one is disputing that. Because the defender headed the ball, that ends that phase of play so VAR should not have been involved in showing Pod to be offside, and as the linesman didn't flag, that should be the end of the phase.
So when the Saiss shot goes into the goal, that is in another phase started by the defender's header, and should therefore have counted.
That is what has happened in other games as explained by another team's player. Consistency is everything.