That doesn’t make their claim on the land false. The vast majority of them are still from Lordaeron. It’s always been their home. It doesn’t stop being their home because they had a change in health status. When Calia came back on the scene she saw them as the same people from her kingdom. And she’s not on the throne because she doesn’t want that, nor do the forsaken, and frankly nor do the players.
Let’s hope not. The forsaken were setting themselves up in the city proper at the end of the heritage quest. So hopefully it gets rebuilt in an update.