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Some key insights from the article:
Basically, what they did was to look at how much batteries would be needed in a given area to provide constant power supply at least 97% of the time, and the calculate the costs of that solar+battery setup compared to coal and nuclear.
As others have said this is for Las Vegas which receives wayyy more sun than the average place. But the other misleading part is they looked at 20 years which is close to the life cycle for solar/batteries and not even half the life of nuclear
Brother, with some luck a nuclear plant is in construction stage after those 20 years
China has been doing them in around 7 years from groundbreaking to grid connection and is trying to get that down to 5 years with their bailong power plant as they are developing an experienced work force and actually have experience making the parts