If it's based on xG I guess it means that the opposition has scored more goals against us than expected this season, which implies either our keeper(s) have underperformed at saving or the opposition has overperfomed at shooting, or a bit of both. Goals like the Watford halfway line one will be a huge xG overperformance, and we do seem to concede a lot from outside the area in general, so that will probably make up a big part of it. But then it's whether you blame the keepers, defenders or tactics or something else for that. As with many stats, it could be interpreted any number of ways and I imagine the analysts employed by clubs will have ways of getting a more reliable picture out of it.
Measures how many goals conceded against the XG of the shots faced. Out of the 42 goalkeepers to play in the championship this season our pair are 38th and 40th despite playing about half the games of others.
"We mostly have the right players, though not necessarily always in the correct positions." Are we signing Andre Preview to play the Tiger Rag on the Joanna?
Apparently his training regime consists of a light meal, taking penalties against other goalkeepers and then departing. He's wrote a book about it... Eats, shoots and leaves...