Is it true that did korn do the voices in south park based on the following text?

''Korn's Groovy Pirate Ghost Mystery'' is the tenth episode of the third season and the 41st overall episode of Comedy Central's animated series South Park. It originally aired on October 27, 1999. The episode features issues of necrophilia and a parody of the animated series Scooby-Doo (with the band Korn filling the role of Mystery, Inc.).
yes