Presumably it's an old set that was never released back in the day rather than something shot recently?
Its probably an older set, but we may yet see a resurgence of older models - depending on how Covid19 effects western and eastern Europe economies. People gotta eat, and I assume nude modeling is a job well suited to social distancing, particularly if the model can do her own makeup and hair. Got my fingers crossed for Ariel, Eufrat, Iveta, Jenni, and Antea. I would love to see the more mature version of these women.