Let's say I build a machine that collects rainwater and turns it into gold. When its raining, gold pellets come pouring out. When its not raining, the machine doesn't do anything. Do you really think that sort of behavior is accurately termed "unreliable"?
Yes, when we need power 24 hours a day, wind and solar are unreliable.
The new system, using intermittent power from wind and solar, accounted for 110 GW, nearly 50 percent of all installed capacity in 2019, but operated with a capacity factor of just 20 percent. (That included a mere 10 percent for solar, which is hardly surprising, given that large parts of the country are as cloudy as Seattle.)
20%.........10%
Does that sound reliable, even using liberal math?