As tested, it doesn't matter because the disc didn't even have a UV safe resin. The lifespan of the data area is only meaningful if the rest of the disc is intact.
Granted, archival discs aren't designed for full-sun exposure to start with, so in theory, the failed disc could have outlasted the other under real-world archival conditions, and this test wouldn't reveal that.
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As tested, it doesn't matter because the disc didn't even have a UV safe resin. The lifespan of the data area is only meaningful if the rest of the disc is intact.
Granted, archival discs aren't designed for full-sun exposure to start with, so in theory, the failed disc could have outlasted the other under real-world archival conditions, and this test wouldn't reveal that.