Now I could be off base because I've only studied Rosa and early 1900 Germany a little bit, but weren't the majority of Luxemburg's detractors moderate Soc-Dems that were already in state power? They coopted the communist movement that overthrew the kaiser to install themselves and continued to use the revolutionary currents dull the edge of communists with moderate thought and to validate and empower their own position. It makes sense to me that a lot of these pseudonyms weren't subject to state repression as much as retired because they were exposed as mouthpieces of the state.

Of course that's just most of the opposition that survived, anyways. The state at the time really liked using machine guns and mustard gas against suspected revolutionary communists so its also very possible that evidence of greater left dissent against Luxemburg was just destroyed. I suppose I would like to know more about footnote 35, because again I am not an expert on this.