Shelia system

From Memory Alpha, the free Star Trek reference

The Shelia star system was the home system of the Sheliak. (TNG: "The Ensigns of Command")

It has not been clarified if the Shelia star system is the same as the Sheliak system orbiting the primary star known as Sheliak. If so, this would seem to contradict the theory of Tau Cygna, a system claimed by the Sheliak, actually being Tau Cygni, a real binary star approximately 69 light years away from Sol, as Beta Lyrae is ca. 882 lightyears from Sol, and thereby almost 13-times farther away than Tau Cygna.