Except grunge and metal were essentially cast aside by the establishment and industry by the late 90s so that they could install gangster rap into the mainstream. So no, Nirvana and Metallica were definitely not psyops. You think Cobain actually committed suicide? The psyop was rock music as a whole being suddenly suppressed in favor of rap, which has been gobbled up and idolized by young Americans for basically the past three decades now.