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The concept is a character with a strong sorcerer bloodline being raised in service to a deity, and being gifted with the ability to merge a bit of what is typically divine magic with the character's innate arcane potential.

As a variant on the Empyreal Sorcerer, this Archetype would replace its bloodline spells with spells from the Cleric's spell list. It gives a bit of extra utility, allowing the Sorcerer to be a back-up healer (if desired) while not overshadowing the abilities of Clerics and Oracles.

Hypothetical, If a player asked you as the DM if they could play this variant in your game, would you allow it? Would you impose any restrictions? If so, what?

Why is there no FAQ or Errata on how these rules interact?

Without such a definitive statement, the loudest voices are asserting that said spells are not gained because there are no prepared spell slots, so spells being on the list of spells to prepare effectively don't exist.

Personally, it would make much more sense to make an Errata that says that in the case of a rule adding spells to a list of spells that may be prepared for a Spontaneous Caster, instead add those spells to the list of spells known.