This is Warped Tour where they're the classic staple act. Warped Tour would never turn down NOFX. They were there biggest band of the Warped Tour along with Bad Religion all throughout Warped history.
There was some promoters that wouldn't promote them after the PRB thing, but that's over for the most part. Except in Vegas, doubt they'll play any Vegas shows again, especially PRB. They just dropped out of the upcoming PRB they were gonna play due to bullshit death threats. They apologized, it's ridiculous they're getting death threats over a bad joke.