Earlier quoted context omitted.
My understanding is that you can turn gas plants on and off very quickly, and they can run at any time of day. That makes them excellent suppliers for peak demand. For much of the year, the evening peak occurs when the sun is not shining and the winds have died down, so renewables are not viable.
Renewables can be combined with storage technologies such as batteries, so the syllogism "no generation during Dunkelflaute, but need reliablye generation -> renewables not viable" is too simple. My question is about whether renewables with storage technologies are a viable replacement for the gas power plants.
I'm guessing probably not. If it was truly the no-brainer "cheap AND fast AND better" option everyone thinks it is, data centers would be rolling out renewables right now. They're not so dumb that they'd pass up on a superior, cheaper solution just because.