Release Radar by its nature will try to recommend tracks with very few plays (if any). It is supposed to solve the "bootstrap" problem in recommendation systems.
In retrospect, I think it's more likely that Fake Fanny Mendlelssohn did NOT inform Spotify that they were a different person, and Spotify only split it out after a lot of Felix/Fanny fans clicked "I did NOT like this" when the track was put in their Release Radar.
The Release Radar playlist is supposed to contain new releases from artists you already listen to. I think you might be right about the release radar being a method they use to separate out bands with the same name. I've definitely noticed bands with the same name in my Release Radar. It would be useful if Spotify exposed a method to report different bands under the same name. The do not recommend is a different signal since maybe I also like the new band. I probably mess up Spotify's recommendation algorithm for me since I use the heart button to flag albums as listened to regardless of my enjoyment since there isn't a another way to mark albums as "listened" like there is for podcasts.
