It’s kinda offical but not quite. It’s ported over and distributed by some Spotify engineers who wants to use it for Linux, but as far as I can tell, officially as a company Spotify don’t support Linux as a platform. Source: https://www.spotify.com/us/download/linux/
Funnily enough that is the exact situation I got. Parents started paying for Spotify almost 2 decades ago, and the great people they are have just kept it going since for me. I do have a YouTube premium (I know this is a bit frowned upon on Lemmy) sub going, but YouTube Music just doesn’t quite function the way I want it to.