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.