Well, but "divine" could in this case just indicate the divine quality of this ability. After All, the Powers have all sorts of abilities names "Divine ..."
And it would even fit, because Rao has
3/3/3/3/2/2/2/2 cleric spells above 9th level,
Tharizdun only has 3/2/2/2/2 cleric spells abvove...