Well, the cue in question is "Opening Theme"... if I had to guess, I'd surmise that a music-only source didn't survive for the score so this might just be essentially the Main Title pulled off the combined film audio?
EDIT: Nevermind, apparently it's the only thing on this new album which is also a new recording, "arranged and performed by Mark Northam". So presumably not even the opening theme could be pulled off the film audio intact.