1969 Nova L78/L89 question

[Mr70]

11 years ago Bob Johnson himself used to frequent here and went by HiPerf.
The Black L89 Nova @ Legendary was talked about here along with this placard in the trunk.
4 pages long https://www.yenko.net/forum/showthread.php?t=92366
Some memorable Quotes from Bob:
*Chevrolet never built or sold an L89 Nova. I would really like to see the paper work to this car.It is a strong statement and one i'm sticking to,the car was never build. I don't mean to offend any one but if some one has paper work for a 1970 L89 Nova,its fake.
*I don't have anything form GM saying that they were never built if thats what your asking.
*If you walked in to any Chevrolet dealer in 69 or 70 and wanted to order a L89 Nova they would tell you its not possible. I tried to order a L89 Nova from Chevrolet in 1969 and could not get one. It was just not built,i'm sorry that its to hard to believe. I could get just about any option on any car,but the L89 in a Nova. If you have paper work to prove an L89 Nova was built,there are many that would like to see it.
*I was the one trying to buy the cars from Chevrolet,not the dealership. I could get you as many 427 Camaro's or Chevelle's you wanted in 69,those cars were easy to come by,Chevrolet made lots of them.
*Did any Novas get converted to L89 at your dealership for customers or for stock after you found out you couldn't get one direct from GM?.... We would install anything that could not be ordered from the factory on any car.