Nationstates still modelled after world government established. about epitaph HOT 3 OPEN

Good catch! I think this one could be rationalized by saying the "peacekeeping forces" of the united government were the ones to deploy the AI, but in that case there should probably be a modified version of the flavor text that doesn't refer to a particular nation.

from epitaph.

That could work.
Also possible is one of the other AI failure modes, like it's told to minimise human suffering and decides that the best way to do that is to kill all the humans, as they have 0 suffering while dead.

from epitaph.

Could probably just make a separate Skynet style event specific to after world government has been established.

from epitaph.