Festaes are festaes, I agree. There's no red, green, purple strains, etc.
Listen, life would be great if we called all fish by their scientific Latin names, but that's not reality. When people look for Green Terrors, Angelfish, Discus, Jaguars, Red Devils, etc. we all know what they are looking for.
The same goes for "red terrors". The New World Cichlid enthusiast who is in search for the red terror is obviously looking for the festae and not the uro.
There's enough information, ad nauseam, about how to tell a festae apart from a uro, that the buyer should be able to tell the difference. If not, so sorry, thank you - come again, life goes on.
I for one like the fact that festaes are still somewhat rare and not in every petstore.