The question specifically was relating to "diagram 4". The player, in that case, becomes active when the referees (well, AR to be precise) deem them as interfering with play. Which is often before they play the ball (and thus interfere with play).It never is though. Where the AR flags is nearly always many metres out from where the player becomes active.
If only the laws did say to take it from the AR’s position.
In the case where this isn't the case, then it's where the player actually interferes with play, the opponent, or gains their advantage.