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https://imgur.com/Z2WSvjj

And this is a pretty conservative set of lines from the guy who drew it. The line on Gordon is at his knee, rather than at his outstretched foot which isn't visible from this angle, while the line for the ball is so far right, that if the ball was any further right it'd be visible - even though it obviously hit the left side of Joelinton.

If they'd drawn the lines at Gordon's foot from a different angle, the line would go somewhere in the visible space right of Joelinton and behind Gabriel, which would mean that even if you can't pinpoint the ball, you can see that it's at least half a yard offside.

It's much clearer than the the time they couldn't find Cucurella's foot because he was blocked by his own keeper, so they just gave up after 4 minutes and guessed that Martinelli was probably offside to overturn the goal.