IF that court case was binding, why is it not cited to stop voter ID requirements when they are raised by a state when Republicants are in control? In Tennessee, I have to show my photo ID and sign a book every time I go to vote before they will escort me to a machine. It has not always been that way, and in fact I think the changes to the present system are post 1987.
Because the RNC is not the State that enacted the law such a binding agreement is not applicable -- IOW, it would be like you arguing that because Golden Corral gives food to veterans on Veteran's Day that the bank should give money to veterans on Veteran's Day.
“why is it not cited to stop voter ID requirements when they are raised by a state when Republicans are in control?”
The RNC is bound by the agreement, if in fact there is one, not individual Republican officials. Republicans represent the electorate in office, not the national committee.