If you're still working/engaging with Postone and the concept of Superfluity, I think you will find this compilation I made with GPT-6 to be a very helpful resource for your purposes. Besides Postone's main published works, I also had it ingest transcriptions of his 2015-2017 lectures and seminars on Marx's Capital (full walkthrough of Vols.I-III). advanced GPT-6 model parsed all the transcripts and extracted relevant sections of transcribed speech with timestamps provided and compiled a comprehensive map of every instance where the 'superfluity' thematic was detected.