I think a season-long nagging injury contributed to an eventual change in approach on offense for the Flyers this year - and the two-qb system worked fairly well. It can certainly be argued that NB beat the Flyers on excellent special teams play rather than shutting down the ML offense.
And I'm guessing the kid (apparently, per the original post, a senior on the 2019 squad) who stated that Goodwin got too fancy on offense this season wasn't making a strong indictment against his former coach. Instead, he probably thinks the world of Goodwin, but felt the coach could have had even greater success by keeping things simpler.
Taken out of context, the 'too fancy" statement sounds like a strong criticism when it might not have been. Maybe the kid has heard from his dad about the good ol' days when the Flyer offensive attack was straightforward and unsophisticated - like when tailbacks such as Marc Otte got at least 25 touches every single game!