Which again is a Pep tactical change not an Erling one. We scored (94 + 96)190 goals in his two full seasons in the league . The two seasons before we scored (99 and 83) 182 so we can skew numbers and argue over a mammoth 5 goals in one particular season (in the league, we scored more overall the season we won the CL) if you like but overall numbers still come out in favour of the team with Erling.
Also won a Champions League with him vs none without.
We had a season where we scored 102 goals and finished 18 points behind a Liverpool team that scored only 85 which show how useless a metric over all team goals are in a season.
Would you rather a 10-0 win and 2 x 1-0 defeats over, 3 x 2-0 wins?
A handful of goals in one particular season doesn't matter. To put it in perspective, the 5 extra goals you speak of, came from a 7-0 win over Leeds and a couple of hammerings of Norwich (9-0 over 2 games). hardly a huge difference on the season as a whole.
In his first season where we scored a mammoth 5 less league goals with Erling, we stuck 6 past United, 4-1 vs Arsenal, 4-1 vs Liverpool, 4-2 vs Spurs but didn't rack up the same goal difference against mid table teams, which is funny considering say Erling has made us worse in big games and doesn't perform. We also won our CL home games, last 16, 7-0 in the first leg vs Leipzig, 3-0 in the first leg vs Bayern and 4-0 in the home leg vs Real.