More the quality of the shot opportunity afforded the opposition. I imagine it’s incredibly hard to asses but put it this way; If 2 keepers face 100 shots each but keeper A’s shots are all from 5 yards wilts keeper B’s are from 20 then the stats are going to be skewed because of the relative ease of scoring from 5 yards as opposed to 20.
Ya get me, blud?
Think that table is based on that sort of thing.
He’s let in two more goals than he “should” have done.
Whereas Alisson has let in 7 fewer (eg saving Gomes’ header, I’d imagine).