>Nuclear is insured.

You should read the article you linked to. It actually explains that nuclear is defacto not insured, and that is the reason why they have only paid 15000 euros in total.

The TLDR is that basically no matter what happens, the cost is covered by the government of the country the plant is located in, and secondly other governments.

This is course also true even if nothing goes wrong with the plants, future tax payers pay for decommissioning, maintenance, storage etc.