Wait, am I reading it correctly that your reference is saying that the cost of fuel and operation of a nuclear reactor alone are already around the same value as the total costs for PV solar?
Just the turbine part of any power plant that converts heat to electricity is expensive enough that it has problems competing with PV in sunny locations (if you only include a little bit of storage in your calculations)
What I got is that if you had a perfectly fine already working nuclear plant, completely paid off, it's about as profitable to abandon it and build a solar plant as it is to run it.
I didn't expect that.