The explanation of how to determine the ball is over the line or not is undoubtedly right, and it does look like the decision was correct by the laws of the game.
The 3 things I'd say about it
1. Without Technology, that ball is given out of play 99% of the time, to the naked eye it's out the park. And as no official is ever standing directly above the touchlines or goal lines, this is a goal that only games with VAR will ever give. I always understood there only to be a camera looking down on the goal line from the crossbar, did FIFA actually have a camera looking directly down on this? Or is it inferred from the camera angles we have all seen?
2. We can all be pragmatic and objective in this instance. But if that was a goal against Rangers, would so many still be saying that's the rules?
3. I reckon this who debate proves once and for all that the Russian linesman got it wrong in 1966!