It appears to be a widely quoted official figure and have no insight on if it is realistic. I am also aware that this does not consider the considerable environmental impact of the disaster, nor the economic cost to clean up the mess.
My comment was more relating to the facts about the current state of renewables.
The 2 options this comments OP provides at the end are what I mostly agree on, where we either go 0 carbon now and accept nuclear (with its flaws) as base load, or continue with carbon intensive tech as base load and continue to build out renewables on top.