My post wasn't about Ciri, but about new dialog options for Yen, so I'm moving it here again.
But they never were. While Geralt and Yen being alive is explained, for example, Professor well-being is still a mystery. There are several such inconsistencies, as with Ciri being able to save the world and not her child, Emhyr suddenly publicly announcing that Ciri is his daughter and so on. But these aren't matter that much as long as the story is consistent within the game itself. Players might or might not use books lore in their playthroughs, the game supports both options and that's good.Hard to disagree BUT they still claim to be a CONTINUATION of the story told in them, so everything book-wise should be valid in the games.