i guess someone just forgot to add the xml tag in the ice demon promotion that they are not alive.
Thought so.
Here is also a little quirk which is not only related to the Frozen: AI players are sending wave after wave of their disciples to my cities to spread religions. But of course these religions are instantly removed from my towns. Maybe AI players shouldn't try to spread religions to civilizations like the Frozen (and Infernals?) because it is senseless at all.