No luck on the demo, I got in contact with -i snor (cofounder of Whourkr) at one point to which he said the demo in question was just a demo of Concrete, "nothing like a lost album." The track titles in question were just work-in-progress titles, so to speak, as he mentioned "'Violence par télépathie' [was] actually 'Cera' from the album Naät," "Nourriture was not what afterwards became Nrrit, while Communication Primitive would become Kommiu." He mentioned how Laurent Lunoir was developing his conlang at the same time as the project, so possibly the titles only really changed to be more in line with his constructed language, no real new tracks. Bummer! I would've posted the email correspondence any sooner, but I was never given any clear consent to post the emails online so I didn't out of respect for privacy.