Nuclear is more flexible than coal and on par with some gas plants. BWR's are even faster. Your second link about french modulation proves that. Or you can check directly on RTE website
EDF is crying because ren get CFD's and curtailment payments while EDF does not.
The paper you posted is so funny. The author is also the chief editor of the journal the paper was published. He is also one of the founders of DK antinuclear movement which resulted in DK becoming one of the largest coal consumers at that time. His previous paper was subject to correction due to favorably "omitted details". His current paper still assumes for some reason dirt cheap hydrogen firming for renewables. Shall we check the cost of pure H2 firming per Lazard?
Not only DK has worse emissions than France - it also managed to piss off Norway and Sweden https://montelnews.com/news/0138d712-3afd-4590-883e-4b9221fd...
https://www.reuters.com/business/energy/sweden-pauses-plans-...