They are in fact referencing project 596, which was a nuclear test conducted in a very remote desert region called "Lop Nur". This region was chosen because it is just over 300km away from the nearest town.
Meanwhile, the American Nevada test site was located only 65km away from the nearest town, and the USA remains the only country to have dropped a nuclear bomb directly on a civilian population, and they did it twice. (not even including the times they dropped nukes on small island populations, promising they'd be able to return.)
Don't forget the brits nuked their own troops as a shoddy experiment. Put some new recruits on a boat in the south pacific. They didnt tell the troops they would be seeing the bomb. When it dropped they were close enough that they reported seeing through their skin like an xray. A huge percentage got cancer and ptsd.