He just said that in an interview for an Argentinean show. He was going to do an acoustic cover of the song because it was blowing up everywhere but Justin Bieber got involved first on the remix so he decided not to.
I NEED THAT ACOUSTIC COVER N O W! For science, obviously.
List of Mike Dirnt harmonies that warm my cold dead heart
1. “whaaaaat am I/waaaaiting for youuuu nowwwww” (Haushinka)
2. “Youuuuuuuu don’t know/say” (Prosthetic Head)
3. “Scream AT ME until my EARS BLEED” (She)
4. “Did you remember to paaaaaaaay the utilityyyy” (Warning)