I believe what she's saying is that the pastel gene has been bred out by a lot of people. Some people started with sub-par single gene pastels and bred them to dark normals or other sub-par quality genes. These sub-par parents will generally produce sub-par offspring. So, if the person who bred the snake in question is working with two sub-par single gene pastels, that the single gene pastel offspring would also likely be sub-par. If the breeder is producing sub-par pastels, it is likely that if they hit the super, it would also be of sub-par quality. So, it's possible that this is a super pastel created by two sub-par single gene pastels, which results in a sub-par super that others might mistake as a single gene pastel.
Clear as mud now?
Short version... It's possible that this is a low quality super produced by low quality pastels...
Assuming the parents of the snake in question were both pastels, is there anyway of knowing for certain whether we are looking at a super or just a regular pastel short of breeding the snake? (I'm guessing the answer is "no," but I want to be sure.)