I know Nintendo will never allow it to exist in the open but is this a way to archive the actual levels or just a list of names/codes? I'm genuinely sad thinking about the (very real) possibility of them vanishing forever.
Most likely Nintendo (being an extensive AWS user) will just ship the levels to some S3 bucket; never to see the light of day. Even if each level were just 2 MB, that would cost them only $46/mo. to keep 1 million levels.