It costs more to produce that electricy with nuclear than it does to produce it with other technology. Making lots of cost inefficient electricity is still making cost inefficient electricity.
The other table has newer studies than 2015, where nuclear is not cheaper, but you’ve only pointed out the column where they found it was cheaper 10 years ago. Wind and solar have gotten cheaper to produce, and nuclear more expensive. It is not cost efficient compared to other modern options.
The high production capacity drives down the market rate by flooding the retail market
It costs more to produce that electricy with nuclear than it does to produce it with other technology. Making lots of cost inefficient electricity is still making cost inefficient electricity.
Electricity production costs of new power plants in €/MWh per the 2015 column are consistently some of the lowest across sources, with Hydro being the only serious competition.
The other table has newer studies than 2015, where nuclear is not cheaper, but you’ve only pointed out the column where they found it was cheaper 10 years ago. Wind and solar have gotten cheaper to produce, and nuclear more expensive. It is not cost efficient compared to other modern options.