No player scored every chance they get.Not looked at his xG stats, but he still should be scoring those chances.
That one was classed as a 'big chance', and had an xG suggesting it would be scored around 1 in 3 times (probably because he was so close to the goal and directly in line with the keeper, the difficulty is heading it beyond the keepers reach without much distance to do it in).
Erling has missed 12 big chances already this season in just the six PL and CL games. He was by some distance the player who missed most big chances in the Premier League last season too!
Phil's performance against his xG suggests he scores more than expected, but he's still going to miss a lot, as that's football :)