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What they do is just add the spells to what you can prepare. That's why they aren't normally something on the Divine List. This specific case was probably a mistake. Possibly Detect Metal wasn't on the divine list when they were written, then they weren't updated when that changed.
Nice catch. I didn't even notice Detect Metal was a cantrip so that is extra unusual.
Looking through the other elemental lords, Kelizandri is probably the better example then. Grants Fear as a 1st level spell, another all-tradition spell. Curiously, he debuted in Gods and Magic so it seems this isn't a new oddity.