Most of the albums are listed under Stahlnebel & Black Selket as a single group here. But they also have individual artist pages Stahlnebel and Black Selket. Most of the releases include both of them, but not all (like this one with just Stahlnebel, and this track with just Black Selket), and the discogs link on the combined page is dead (this one) and instead all the albums on discogs are credited to both separately (like this).
So, it seems to me like it would make the most sense to split the credits to the two separate entities, but it looks like at some point they used to be credited separately, but combined in this & other edits. So I’m not sure - what’s the distinction between a single group, vs. two separate entities collaborating?