Original Post — Direct link
I finished the two main missions that are related to the castle settlement and I seen the cutscene for the "7 people left" and I went and destroyed that lab. The castle has been grayed out this whole time and I can't seem to progress to get it to be out of the "destroyed" state.
Im seeing this is a bug but only for consoles, Im a PC player.
over 4 years ago - Ubi-Lucipus - Direct link
There hasn't been any plans to bring the Caste Settlement back into action, it's been mentioned on SOTG a couple of times.

It's simply an inactive settlement.
It features briefly in the Broken Dawn novel, which sheds some light on what happened; but beyond that it is supposed to remain inactive.