Finally had chance to have a look at the xG data, and to answer your question, GT, our xG in the league is 68 and we've scored 72, so we're actually overperforming using this metric.
However, having read up a bit on xG, I think it's not quite capturing our problem, since it only measures the chance of scoring from shots. For example, if Sterling had actually missed the ball instead of just missing the goal on Saturday, that wouldn't count as an expected goal, because there wouldn't have been a shot. So xG fails to capture all the times we get into fantastic positions, but don't pull the trigger, which means that if we faff around in the box, making 5 passes before someone gives the ball away, that also doesn't count towards xG. A better metric would also include positions that you could score from, if you did decided to shoot, as well as the actual shots. I suspect we'd be way below our expected number of goals if that was the case.
The website listed above is a real treasure trove, by the way, and amongst other things, shows the surprising stats that Sterling has actually scored more than his xG (his finishing has been better than average, when he shoots - even including Saturday's abomination!), but Gabriel Jesus is almost 3 goals behind the average striker in terms of goals from his shots taken.