Isak actually admitted that he caught him in his post-match interview but said he thought he was on the way down before he did. I think the issue with it was whether the onfield decision was a clear and obvious error and there is no way they are going to issue apologies for that, as currently there is no rule in place regarding how long they take.
You need to start enjoying the game and stop getting overly invested in the referees decisions, although its proabbly a bit late for that now. They are not going to change them anyway. I don't believe any of the conspiracy theorists on here. I think the standard of refereeing is getting worse, but that's down to the introduction of VAR, and it influencing the onfield officials primary decision-making. Its also affected the players as I think they think they can influence VAR looking at something by making a fuss about it. It needs sorting out, and in fact I would go further and try scrapping it for a season and see if things improve.