Thank you for your inquiry. Per our Skrillex biography, "Sonny Moore put his gig as post-hardcore frontman behind him in 2008 when he left his band From First to Last and created the dancefloor-oriented project Skrillex."
As such, there is no appearance of "Skrillex" before 2008, although Sonny Moore is not, actually, four years old.
I have also sent this to our editors for further consideration. Thanks for writing!