Yes. I believe the artist was going for servants who came in contact with the Outer Gods, not foreigner servants in general. Nursery and BB are there because of Shub-Niggurath (from Prisma Codes, which you posted) and Nyarlathotep (ServaFes). Meanwhile, XX, Voyager and Idol Alter doesn’t seem to have any connection to any Lovecraftian figures. Yet.