IMO, this frameset IS a Cinelli, just not a Supercorsa. Being made from Columbus EL, it no doubt is a top line Cinelli model from that era.
Thruout the latter 80's and thru the 90's, Columbo owned Cinelli Cycles( part of Gruppo,Spa. which includes Columbus Tubing, Cinelli and until recently,3TTT) produced a whole series of models showcasing the latest in Columbus's tubing line and of course their own btm bkt shells and fitments .
All were fine bikes but none have had the staying power of the classic Supercorsa.However, were they were never meant to .
Supercorsa serves a separate & distinct purpose at Gruppo, tying the company and it's products to it's historic past.
Besides the accessory lines, Cinelli today exists to a large extent as an R&D and promotional arm of Columbus.
When new tubing products are developed, Columbus uses the Cinelli brand to exhibit and display to the industry how their latest and current line of tubesets can be utilised in manufacturing. Often you will find on current Cinelli models, tubesets, lugs, ancillaries and configuration combinations a full year before their appearance elsewhere.