Yeah, it seems like a syntax error was the issue. Anyways, I went ahead and added a better tier of stellar array called a stellar swarm which is more expensive and takes longer to build but can counteract extreme heat and cold
Actually I'd like to make it so stellar mirrors can help with extreme heat/cold. I tried to add 'very_hot', 'very_cold' to the stellar_reflector_suppress_conditions line in terraforming and Station Construction\data\campaign\terraforming\project_effects.csv but it doesn't seem to do anything. Also tried deleting the 'hot' and 'cold' tags and it doesn't do anything either, so I'm probably not editing the right CSV
Can we do anything about Very hot or Very cold planets? So far I've only seen the stellar shade/mirrors able to counter cold or heat, but not the extreme variant.