No that claim isn't backed up by any sources I could find. Sounds fringe attitude to me. It's a good thing that people study this as their job and advise the legislative branch because it's complicated. When I looked up the levelized* cost of energy I had a hard time finding sources that agreed with each other. In particular, the nuclear societies were skewing the data, but the same with certain German think tanks claiming the exact opposite. Debate all around. Hydro FTW.

http://large.stanford.edu/courses/2018/ph241/wang-k2/

https://www.eia.gov/outlooks/aeo/pdf/electricity_generation.pdf

https://en.wikipedia.org/wiki/Economics_of_nuclear_power_plants