The promise was that they would try by the end of 2023, not that it would 100% be done. They had plenty of time to get it done, but didn't. It doesn't take long or much effort to release an already built SRD into CC.
@Parmandur I don't agree that releasing less than all of them at once would have been half assed. If they had come to us in say November and said, "Guys, we are behind with the 5.5e books so we just don't have time to build SRDs from scratch for 1e and 2e, but 3e already has one built so we're going to release that to you now and the others by X date," that would not only NOT have been half assed, but would have gone a long way towards showing us that they are really making an effort to do what they said and not just push it off until they can be bothered to get around to it.
They still need to foster good will. What they did by putting 5e into CC was just a band-aid that is helping to heal the OGL wound, but the pain is still there under the surface. They don't have much