Indeed, ghost writing/producing being so popular in the ecosystem that if a "Real-name mandate" happened over-night, much of the industry would be in shambles as people realize most superstars don't write and/or produce their own music.
they can look up credits of any given song right now and realize that literally everybody involved in music making has some sort of made up name, be they a singer, songwriter, producer, engineer, or whomever. like, spotify has a credits button. it's not really a revelation.
there are some genres in which making up artist names, even just for a one-off release, is almost the point and part of the fun of making music. should artists be forced to release music under one name exclusively as well?