No, the rules are still the same, but apparently Spotify doesn’t give a f*ck about about it.
That being said, there is a chance that mAirList will receive a Spotify plugin one day. Right now, the problem is that Spotify has discontinued their old desktop SDK (libspotify), and even though they promised to release a new library during 2016, they haven’t done so yet.
https://developer.spotify.com/technologies/libspotify/
So right now, it is technically impossible to create such a plugin.