Why would you jump to this conclusion? I wonder why some people on internet are repeating narratives like drones.
Poland has largest use of coal in EU. Czechia and Germany are behind. Poland is including energy from sun and wind now a lot but there is still long way. Unlike surrounding countries they never had nuclear for some reason. https://app.electricitymaps.com/map/zone/PL/live/
Polish coal is said to have a high sulphur content which won't help either.
Soviet Union was unwilling to put nuclear that far west, and then after Chernobyl most nuclear construction was cancelled.