I think that's just the generic 'on your faction' text template, considering the the largest portion of nobles are backing a leader in the Empereal civil war, as the empire states are 3 large factions to the other side factions just being, 1 each.
I also believe Calradia as a whole is, effectively one massive civil war from the empire technically? Not 100% on that, but the quest dialogue did seem to semi indicate that the Bannerlord is going to be remaking the empire, either from within or without.