Hideout Music Player

im just curious why the Lycia boss fight music isnt in the hideout music player, its one of my favourite sound tracks in the game and i would love to see it added, in fact, quite a few of the sanctum sound tracks are missing, the trailer is another one i dont see there (granted a lot of the trailer ones are missing)

this is the sound track im referring to
https://www.youtube.com/watch?v=nphZj9-Vxao


is there like legal reasons some arent added, or are they forgotten?