The text from the module states:
Salvage stat Blocks wrote:
Spell Rejuvenation
You are healed by Arcane energies directed your way
Benefit: A creature with this ability does not suffer damage or other effects from Arcane magic. Instead, whenever they would be affected by an Arcane spell, they instead...
That seems pretty clear to me that it is just
arcane magic that is absorbed. Not divine. Anyone running it in the Legends Campaign should use that.
Philosophically, as I said, I don't like the way the ability is written. I think an effect from the Arcanum is an effect from the Arcanum - once its cast and loose on the real world it all the same "stuff." The different traditions of Arcane and Divine Magic are just different ways to manipulate the residual energy of creation ... they don't represent different kinds of energies. As I understand it. So if you can eat magic spells, IMO you'd be able to eat any spell. In a home game I'd have the statue absorb everything.
My 2 cents