Apparently, England thought the goal had been awarded, so when he said "check complete", he thought he was supporting the on-field decision.
Which raises, inter alia, the following:
It's an indication of how poor the communication is between referee and VAR. Drop the chummy nicknames, get professional and have clear communication for Christ's sake. It's the absolute minimum.
There are how many on VAR?Three? Four? Yet none of them knew what was actually happening in the game?
This is a consequence of putting poor referees in charge of VAR. You get poor VAR. Surprise.
Finally, SAOT won't get rid of human error, there are still a large number of human judgments required, although it would clear this one up because it would say offside or not offside, not check fucking complete. But that is communication, not a technical issue.