This live recording is not a part of the written out score
In bar 682 the gospel swing low appears, written out as a ‘skeleton’ leadsheet. At the end of the score in bar 693 it says ‘gospel repeat ad lib’. This live recording could be a kind of suggestion to the performer for a realization of this ‘gospel repeat ad lib’, a possible ‘coda’ / improvisation part after the end of the written score.