If Kane's foot is exactly level, and he's leaning forward, surely the top half of his body is offside? I recall seeing a video about VAR a while ago and how they could make a 3D representation to include the whole body, this is literally just parallel lines on the pitch and it seems them have just looked at the feet. As it is not 100% clear whether on or off, the assistant's decision should have stood for me.
Interestingly, Chelsea brought a laptop out to the sky interviewer I believe, showing their own angle, which is much better than that provided by Sky:
Sarri said it didn't matter than it was offside, it was the assistant who confused the players by stopping. He said the assistant should have carried on until the action was finished and then flagged, as they do in Italy, I'm surprised he knows that this is correct practise for VAR offside decisions. I agree the assistant may have put the defenders off, but it is their own fault for stopping. He then said he doesn't think English officials can use VAR currently.