Reading that link, levelized solar plus battery storage is twice the cost of nuclear. It is cheap to generate the electricity, but only when backed by natural gas or hydro.
Without battery or natural gas, solar and wind are not useful. You have to have some sort of backup, sufficient to avoid brownouts or blackouts, and so you end up with the full capitalization and maintenance cost of not-solar anyway.
To properly compare solar with nuclear, you must add on the cost of battery and / or natural gas (or equivalent fast backup), at which point nuclear is cheaper.
That's at least half the cost of nuclear, maybe as much as a fifth.