IMHO, the GOPe agreed to this outrageous agreement so the party bosses would have an convenient excuse they could tell to the party functionaries and rank-n-file as to why they threw a per-determined election to their "opponents". Like when Mitt took a dive for his pal Obama, not saying a word about massive open, vote fraud and sabotaging his own GOTV drive.
That agreement does not prevent anyone from changing voter eligibility laws, nor prosecuting voter fraud, nor challenging anything after the election, nor preventing anyone who isn’t the RNC or a GOP official from doing anything whatsoever.