Bear in mind that Kirby Air Ride came out in 2003, on a console that’s only meant to be hooked up to CRTs. How many users back then do you think would’ve had access to this feature in the first place? Or would still be playing this game if/when they upgrade later?
It was uncommon, but not so uncommon that it didn’t warrant being added to the game. Especially when Dolby was handing out licenses like candy apparently. I would imagine it was cheap to get a license, and would make some sense why Air Ride wouldn’t have it. Air Ride is my favorite Kirby game, but even I recognize that Air Ride is probably one of the lowest budget Kirby games.