The one thing the goal wasn't was offside. It's only a thing because VAR couldn't confirm that it wasn't offside but you can fairly clearly see from the replay that Gordon wasn't ahead of play therefore he can't be offside. I thought it was a fairly obvious foul but once the ref doesn't give it, it's anyone's guess as to whether VAR will overturn it. One day they will and say it was a foul and the next it won't be obvious enough to overturn.
As for the comments above about not being able to comment on decisions because Liverpool should have still won. That's obviously a lot of rubbish and also ironic given that the same posters were bringing up a correct decision that went against them 4 years ago when they blew their one chance of winning a CL. Yes, Liverpool could and should have won that game regardless of the penalty shout but football doesn't always work like that. Teams don't play perfect football every week and there will be times in games where they don't play well but get the 3 points due to something like a penalty decision (correctly) going their way.
As for the comments above about not being able to comment on decisions because Liverpool should have still won. That's obviously a lot of rubbish and also ironic given that the same posters were bringing up a correct decision that went against them 4 years ago when they blew their one chance of winning a CL. Yes, Liverpool could and should have won that game regardless of the penalty shout but football doesn't always work like that. Teams don't play perfect football every week and there will be times in games where they don't play well but get the 3 points due to something like a penalty decision (correctly) going their way.