Claudius yep. Haalands beeing outscoring his xG for a few years but this season he's falling behind it. Yet he still has 17 league goals because he still does the same things. The variance on the xG isn't that big.
Most of our forwards are under their xG but only slightly, less than 1 goal (Martinelli is above his but again not by much). The reality is we don't take enough shots. I think that should be obvious when you watch Jesus and Havertz especially. They are not in the box enough and often hesitant in good positions. Same goes for the likes of Ode, Martinelli, etc Trossard even seems to have developed the same problem this season.