I do not know where you got that from and whether you meant to say something else, but those blackened territories are territories which you must have held for at least a turn, but not necessarily by the end of the campaign, as with the rest of the required territories.
EDIT: In any case, much of the victory requirements for factions are outdated, and to see an accurate list, you need to use the "?" in the faction status window instead of using the provided map. Pressing that "?" will give you an accurate list of settlements you need to conquer.
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