Lurric is a term to be used only by unearthly otherkin (such as alienkin, deitykin, etc) who are not attracted to earthly beings. They are not attracted to humans, or any type of therian. They may be attracted to people who are demonkin, angelkin, deitykin, alienkin, or any other unearthly kintypes, including more abstract kintypes like voidkin.
The flag was made by an unspecified person. Reds is for attraction to demonkin, yellows and gold represents attraction to angelkin, blue is for attraction to deitykin, purple is for attraction to spacekin/alienkin, black for attraction to voidkin, and white for attraction to other unearthly kins.