Xavi not really involved in these stats so far, but it clearly shows what we need to improve.
That plot should've been absolute xG on the y axis right? Barcelona being far to the right influences their y value too, making the thing skewed and harder to read.
I also dislike these stupid explanations in comic sans-like text, as well as the colour choice on these arbitrary quadrants, lol. The creator of this graph lacks style!
Besides, I don't think it show anything very clearly. Yes to create more xG is good, and to create more goals or win more games...
To get this ratio up can be done in a million ways, but I don't think staring at this plot does anything. For example, they'd be higher up in this graph if they just played the ball for a throw in instead of getting into the final third a lot of the time when they didn't think they'd reach a shot. Or if they just started to shoot more instead of showing patience and having longer spells of possession, which in turn tires the opposition etc etc...
Barcelona being low
could also be due to a poor front three, and I think they do have a poor front three after having watched the games. But the graph does little, I think. Impressive by Bayern, Liverpool and City of course...