Nobody is suggesting to use solar as the sole source of electricity. That would obviously be insane and then leads to silly numbers like the ones you gave.
A MWh of solar is about 30 Euro/MWh if you levelize the capital costs.
The article discusses why LCOE is not a good estimate of the costs. Yes, combining different sources lowers the total cost (by damping intermittency). For Denmark it's offshore wind and solar in a 7 to 1 ratio (plus natural gas or biomethane power plants).
> Nobody is suggesting to use solar as the sole source of electricity.
The electricity price is not decoupled from the gas price because there's not enough energy storage, wind turbines, interconnections (that is the energy grid can't function without natural gas). The cost of building (and operating) all this goes into SLCOE.
A MWh of solar is about 30 Euro/MWh if you levelize the capital costs.