On Fbref you need to look under the advanced goalkeeping stats for that
its under PSxG (Post Shot expected goals) and PSxg/SOT (PSxG/ Shots on Target)
Basically with shots on target Mes, is expected to have conceded 11.5 goals, compared to the 12 that have been actually recorded as Shots on Target.
Presumably The Firpo and Wober own goals are not classed as shots on target and thus not considered to be detrimental against a keeper
I've always interpreted it as any keeper that concedes +/- 1 expected goal compared to shots on target is performing as expected. Obviously it would be more preferable to have a keeper with a higher +
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