I've never heard the term "non" muscidine/sucapanine (scuppernongs) used before. I have a grape vine that my grandfather planted in the 50s/60s. I also grow a couple different varieties of scuppernongs. I pronounce it scuppernines, but if you try to google that you'll have a hard time.
Grapes are subject to coming down with Pierce's disease if you don't have a variety that's resistance. Also around here birds will clean your grape clock if you don't watch them. They don't seem to bother the scuppernongs.