Likewise a coal plant has not a CF of 63%, but a range from perhaps 60% for a load following plant, and something like 85% - 95% for a base load plant.
I personally don't see a difference between a dispatachable coal plant that idles at less then 10% of its load over night, just to keep it warm, and peaks to 90% of its max over daytime versus a solar plant that idles during darkness at 0% and ramps up following daylight to 100% around local noon (or what ever daytime the plant owner decided to have its maximum.
I see a big difference instead. If a coal plant has a CF lower than 85-90% that is because you want it so, that is you don't need that power, while with a solar plant, you may need that power, but it's cloudy or it's winter and you're in the northern hemisphere etc. And that's just half of the story, because electric companies deliver electric power, not energy.