I think it’d be a pretty week argument to claim that a mailed notice, and a mailed notice alone, is what would have stirred action. Not other public notices. Not national news coverage. Just that one piece of mail is what would have made you act in a timely manner.
These disputes are usually “You didn’t tell me you were changing something.” This is, “You didn’t tell me things were staying the same” and as time moves forward it becomes “You didn’t tell me things were staying the same and even after I found out I still waited a much longer time than the notice provided to get around to voice my objection to things staying the same.”