is that its a VFR procedure and the points are not referenced to anywhere
It's not a VFR procedure - it is circling with prescribed flight tracks which is an IFR procedure.
FWIW, the coordinates of LUXUS and PIBON are (from up to date Flitestar)
LUXUS N43 32.9 E 6 59.5
PIBON N43 35.9 E 6 59.0
Hope that helps.