Ironically, I'm pretty sure you're thinking of this article by a Spotify engineer that has since been taken down:
https://web.archive.org/web/20230410041435/https://engineeri...
EDIT:
> We noticed some users complaining about our shuffling algorithm playing a few songs from the same artist right after each other.
...
> Since the Spotify service launched, we used Fisher-Yates shuffle to generate a perfectly random shuffling of a playlist.
...
> The algorithm is now rolled out to everyone using our desktop client and other clients will follow soon.
Everything old is new again.