This is a ridiculous thing to admit to. To openly state he didn't apply the rules of the game is bad but to admit that when he was in the position that is designed to remove errors is insanity.
So how many other decisions have been missed because of tough games or it involved a big team? It questions the validity of the whole refereeing structure at the top level.
VAR, in its current guise, doesn't work. For me, they need to move to a system that is similar to cricket and tennis. The on field ref should be able to go over and look at a screen at the side of the pitch if he or the assistants feel they have missed something or want a second look at an event/issue. No VAR team, no calls in the ear from someone in an office block 200 miles away, just the on field officials using replays if they feel the need. On top of that, each team should have three reviews that the on field captains can request to the referee. If correct, they keep the challenge and if wrong, they lose one.
I think putting mics on refs would also help.