Which wall? He was 1m away from the wall that the ball travelled closer to, the one in question had no impact on the path of the ballThe offside check, which is done for every goal, would have been completed very quickly as he clearly wasn't offside.
They really didn't need any electronic measurement technology, it was that obvious. 1m is a little under half the height of a tall player, Guehi was pretty much touching the wall and was very clearly within 1m of it.
If we look at the VAR protocol, this is one of the listed situations as being in scope for VAR intervention ...
attacking team offence in the build-up to or scoring of the goal (handball, foul, offside etc.)
Was Guehi an attacking player? Yes. Was there an attacking team offence in the scoring of the goal? Yes, as being closer than 1m to the wall is an offence. Therefore there is absolutely no reason why VAR can't get involved in this situation. If it was a case where they would have needed a method of accurately measuring the distance then I'd suspect they would say it wasn't a clear and obvious error and stay out. But not even the most argumentative of people could argue that Guehi wasn't within 1m of the wall.
Hypothetically a defending team could use 9 players to set up three 3 man walls across the the penalty area, covering enough surface area to ensure that any direct freekick directed towards the goal is an offence, should any attacking player be in 1m proximity when the kick is taken
Its just not in the spirit




