Unwinnable missions?

I have a mission: "Raid: Exterminate Society of Chambo Members"

The only settlement Society of Chambo hold is Baudelaire Horticultural Holdings in Chambo, which is currently wrecked and occupied by scavenging pirates. There are no members of Society of Chambo here to exterminate - they're all already dead, killed by the raiders.

Is this mission just unwinnable?
 
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