The average of the other 9 teams is 76 goals. We scored 68.
68/46 = 1.47 goals per game
76/46 = 1.65 goals per game
So the difference across a 46 game stretch, which is a pretty large sample size, is 0.18 goals per game more. If you want to argue that that is significant, then I'd love to see the rational behind such thinking. If they all scored 7 goals in one game, and we only scored 1 in one game, then maybe - but 7-10 short across a 46 game stretch is a pretty poor justification to say that we struggled to score goals.
MK Dons scored 78 last season. We got 68. Now, if we beat them 5-0 on the last day of the season, we'd have both ended up on 73 a piece. That's literally a 1 game swing. It's not like despite that there is a 20 goal gap. Suddenly, in 1 game, we'd be level. So it's difficult to really justify the idea that we struggled to score goals.