It just seems like a bit of a pointless algorithm, that doesn’t say much. If it doesn’t take into account keeper positioning, whether there’s a player in front blocking the shot attempt, etc etc.
And it would also need to account for each individual player’s probability and likelihood to score from any given chance on the pitch. Considering the gulf in quality between players and teams. Also quality of the keeper in net and his ability as a shot stopper, and what sides, angles, positions are most likely to beat him.
If it’s just taking locations of shot attempts in a game and assigning probability of those shot attempts to goals, it’s a completely useless stat.