When the game first loads and the window advertising the event comes up the word Exclusive is underneath the staff. Perhaps they thought this was sufficient to let us know it was exclusive to Daphne? I thought it was exclusive to the event and would not come up in any Gacha.
I got screwed by this one, I will know better in the future.

On the brighter side though I drew two Epic items from the free Gacha yesterday so there is some balance in the world.