I always treated world like that as dead worlds, or worlds with a non-intelligent life population. One interpretation could be a pristine world with a wrecked ship carcass with some fuel in it (unpurified of course lol), or maybe a failed pre-stellar colony remnants. If a dead world i find it useful to geuss (reroll) what the population used to be. T4/marc miller's traveller pocket empires supplement has a table for colonization dates and cause of dead worlds from the long night. Also the wafare rules allow temporary tainting (aka death of lots) of the atmnosphere from nukes.
My take on it due to the hydro being under Ag world classification would be a world isolated during the long night that fell to below TL9 interstellar, had a "civilized" government that attempted to maintain things (gov 5, and TLA ~peaceful, lotsa unarmed types no?), which suffered desertification causing failure of the food base and collapse of society. Lotsa TL7 road/city ruin wreckage maybe. Alternate arguement could be it's a nobles holding somehow, and theres a ship in the system, TL7 so non-jump capable, which serves as the "authority" for it. Or maybe there are rabid squirrels that ate evryone lol who knows. I'd be tempted to make it an amber/red zone somehow, as it appears to be quite a fine place to live, especially compared to say C53258A-9.