for me, it’s pretty confusing in quite a few instances, but, just to give an example: if the striker shoots and the keeper saves it, but the striker taps in the rebound, how is xG counted? is it counted twice or just once? or, what if neither shot goes in?
All those new weird metrics are confusing in general and are mainly used by internet nerds to prove that their favourite player is better than others. I’ve been watching football for decades and before the 2010s people barely cared about who had a lot of assists, now you have all those weird xG, xA, dribbles per 90 and I don’t even know what else.
Real football fans just watch games and judge performances that why, I wouldn’t give a shit if my team’s striker had awful “expected” stats but still delivered.
Every stats compiler has their own method and algorithm to calculate “xG”.
It is a fake stat, ignore it.