ok but much like the professor here i think you miscalculate how the structure of the league fits into your theory
'the NFL' is an aggregation of 32 entities designed to further promote their collective interests, not reduce or influence competition between membership (it's the basis for their product)...similarly 'Vegas' is sort of ill defined as having a singular governing body that would direct (illegal) policy
now parity is absolutely baked into the NFL which helps make it a very attractive betting market but it's achieved through salary cap, draft order, and other collectively bargained framework as opposed to officials deliberately manipulating outcomes