In an interview with the Los Angeles Times, Nikki Sixx acknowledges the band uses backing tracks, but says that doesn't mean they aren't playing.
"You can tell he's working up the stamina, and a lot of people are like, 'Oh, man, he's not kicking a** like he used to,' but it takes a lot of courage to have a doctor tell you you will probably never go onstage again and to fight through that," Sixx tells the LA Times. "If he's got some imperfect moments here and there. They're getting erased as the days go with rehearsal."