You've addressed the question I was trying to ask... "is it ok to reveal secrets of a defunct GLO" rather than "is it ok to reveal GLO secrets to specific people, like your spouse" (although that is also an interesting question).
My local sorority no longer exists, but the sisters with whom I shared that bond are still around. We didn't "declassify" the ritual, so to speak, when we joined AEPhi. We did talk about reworking SigIPhi's ritual into an Inspiration Week activity, but nothing ever became of that. (Some of my chapter sisters don't even know we originated as a local sorority.
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Since we didn't make a decision as a sorority to "declassify" the ritual or share it with our chapter sisters, I feel that my oath not to reveal SigIPhi secrets to non-SigIPhis is still in force. Out of respect for my sisters and our bond as SigIPhis, I have not revealed, nor will I reveal, the secrets (except in the unlikely event that we decide as a sorority that we want to make our ritual public).