Why would Castrum Novum itself be removed in 2.0? Only a part of it is 7th Umbral related, and there's no reason for it to be removed unless Mor Dhona is being removed, which I highly doubt.

7th Umbral Era content is being removed come 2.0, but I wouldn't consider Castrum Novum itself as 7th Umbral specifically. Rather, it's a regular stronghold with 7th Umbral story put it in.