As dfw said...
by wcnitz (2019-01-08 15:58:20)

In reply to: VAR question on the LIV-MCTY game.  posted by G.K.Chesterton

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That is goal-line tech, not VAR. The referee gets an indicator on his watch if the ball crosses over the goal line completely.

I'm not sure if the goal-line tech is directly related to the replay that shows the distance on the TV, but I assume it's the same camera system. So 1.2cm was probably pretty accurate. Doesn't look like it could have been any closer.