I'm sure you're right, he doesn't have any idea what a Rave is. Come to think of it, neither do I. I'm more of a indie / punk concert kind of guy.
The only actual music I've heard from Marshmello is pretty weak.
Speaking of music, the other day my daughter was listening to a cover of Tracey Chapman's Fast Car. It attempted to be a note for note cover, with added pop synthesiser effects. The only problem was the girl could not sing and the autotune was obvious. What a mess.