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Its for cursed objects as well.That seal is for cursed spirits, not cursed objects though. It wouldn't make sense for the breaking of the seal to interact with Yuji, since we saw Kenjaku affect those with cursed objects like him in completely separate instance.
Its why a bunch of people who he planted cursed objects in didn't transform until he used Idle Transfiguration to make their bodies suitable vessels and then broke the seals to allow them to incarnate.