Completely missed that! No wonder that the post made me think of it then!

The tech stack reminds me of this: https://boringtechnology.club/

Also, they have a private API. Minim is a really good API wrapper in Python. The dev branch contains V2 which is currently in alpha

If you’re running Linux, check out QBZ, or qobuz-player if you prefer terminal. The official client also works pretty well in Bottles, but I like QBZ better than the official one