Question about “Portuguese Lunar Landing” on upcoming release

The Zappa website describes :” a trio of live cuts recorded during the tours opening gambit on April 10, 1975 in Claremont, calif.“ But then describes the track as a rehearsal composition taken from a rehearsal reel. My question (if anyone knows), is do you think Portuguese Lunar Landing is a rehearsal track played during a rehearsal or sound check? Or is this a live track played for the audience at a concert?