So due to the Truth to Power lore only being accessible one entry at a time per account per 3 week interval, Bungie's announcement that they would remove the seal from the game came AFTER you would have the ability to earn all the entries. It takes 36 consecutive weeks to complete it if you don't miss a week. We didn't get that much notice.
I know this is content that's been around since Forsaken, but we could have at least had the opportunity before the rug was yanked out from under us.
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Unless Bungie is changing the curse cycle, the seal shouldn't have been vaulted. Destinations are going into the vault that would make it impossible to get had you not gotten the lore from them, but if you had, the seal should still be available as long as lore that's in it is also available. Just my opinion.