Not at all. GOR is still in place, they simply negotiated the cost of it down. Same thing the TX/OU did.
People don't understand that GORs are commonplace legal agreements. They are used in the music industry, and elsewhere. They have been valid for as long as they have been used. They are not some novel legal concept.
If the GOR was not ironclad, you would be out of the ACC today, or sooner than 2030. The exit fees are always negotiated down. You asked out now, not in 5 years. The only thing making that happen is the GOR.
They are an ironclad agreement, but like all agreements they are subject to negotiations.