So, I was out at the crashed Thargoid scout ship just to see what it looked like and I picked up some Thargoid biological matter and resin. After I'd had my fill of taking screenshots, etc. I left for Obsidian Orbital, but found I couldn't sell the Thargoid materials in the standard market. Had to use a black market to sell them and was only getting around 25,000 Cr. So I thought I'd be smart and sell them across several black markets to unlock the Dweller. Spent a 1.5 hours searching for black markets (they were all disabled near my base in kamadhenu) and after the last one was sold I checked my progress with the Dweller only to find that my progress was still 0/5... So, it seems Thargoid commodities not only cannot be sold for anywhere close to the listed galactic average (only got 25,000 Cr. at every black market), but also, they don't count towards unlocking the Dweller [knocked out]