It is almost statistically impossible for them to be this good without cheating. I lost the link but their was a statistical study done and they are outliers to the point of having to have some outside influence like cheating.
How many NFL championships do the packers have, 5 iirc? Was it statistically impossible for Lombardi therefore he cheated?
A great coach can do that for you. There is a reason Belichick is considered GOAT by many.