Rukhlia Katz - What is the documentation that this person was real?

This profile appears to name a person who is fictional, along with her husband, parents, and alleged children. I see no documentation whatsoever. I can find no reference to this person or her husband anywhere except on Geni an other genealogy sites where there is no verification system. Moreover it appears that this person and her husband were invented to explain one family's origin in Kukliai, for which there is no actual evidence. On what were any of the statements about this person based? Published genealogy? State records? Historical documents? What?