Author here.

I haven't seen any evidence of Spotify killing librespot. To me the project looks active and works totally fine. I don't have a new Spotify account to verify the claim above.

I suspect wilted-iris is conflating it with the recent changes to the Web APIs: new developer apps can't use all endpoints anymore. In Fastpotify if you add your Client ID I use both an older developer app and your app to keep everything as fast and seamless as possible.

Have a look at the librespot pinned issues, you’ll see the reports from folks experiencing this. You may also be able to find the legal threats they sent out to third party client libraries if you search carefully (many have been redacted.)