I wasn't aware of this new standard. But the problem is that she acts as if she was the character in some albums, performing with real persons...
https://vgmdb.net/db/covers.php?do=view&cover=67625
In this case, "Shiori Fujisaki" wouldn't be an alias like all others? Just because Shiori Fujisaki is a character we shouldn't differentiate the albums in which Mami Kingetsu is credited as herself and as Shiori Fujisaki?
Also, Miku Hatsune wouldn't be a similar case?