I haven't been in war rooms in big companies and had no idea that they used the term for stuff like this (fixing downed IT infrastructure etc).

My experience and previous understanding of the term was you set up a war room when something big and potentially company-destroying happens and a lot of different people from different departments/divisions need to coordinate very closely as new information comes in and the situation changes more.

Or if there is some distinction between 'trusted' and 'untrusted' people internally, you want the trusted people in the war room and the untrusted ones out.

Wild to me to hear that people call it a war room in cases when the people in the room are expected to be hands-on doing things.