That being said, the real challenge for independent artists is getting "blessed by the algorithm," so to speak, where they actually start showing up in Song Radio and Discover Weekly algorithmic playlists. I'm not keen on the details of the Spotify algorithm, but I imagine labels do help with this, and being on the same label as a popular artist would increase your chances of showing up on that artists' song radio.
This mindset is unfortunately why most musicians fail to gain traction. Relying on an algorithm for success is fallacy, because all of these algorithms are based on input, not random chance. If you're not steadily supplying new listeners through your own direct efforts, then the algorithm isn't going to perceive value and you won't get any benefits from it. Playlisting represents approximately 1% of the independent music industry puzzle.
Parent may have been referring to promotional deals (getting onto official Spotify playlists, Discover Weekly, etc) or special royalty rates. The major labels have tons of leverage, and they definitely cut deals that entry-level artists don't have access to.
You don't need a label to distribute your music on major music services. https://www.tunecore.com/