I agree the two high shell is how teams have attacked QB's like Allen. I remember specifically after the Bills lost to the Jags 9-6 Allen being asked "what were they doing". His response was something like, same as all teams, two high shell. What happened after that? Josh Allen started running, look at his attempts and yards by week in 2021 after the Jags game...that is how they started beating teams, running it. So back to the OP, he is correct you need to run the ball effectively enough. The Bills need to be consistent and effective with running and shorter passes to get teams out of this.
And back to Dorsey vs Dabol....in 2021 (Dabol's last year) the Bills had scores of 6, 10, 15 and 16 that season....that s 25% of games they scored 16 or less. Everyone wanted Dabol fired. What changed was the late season run and two great offensive performances in the playoffs and now most people forget what happened under Dabol.