Ah, that would make sense yes. They did also say intermittency but, yeah, if it's only about true dunkelflaute then...

edit: got curious how much this would amount to, also since the peak demand is usually after sunset. The article (https://onlinelibrary.wiley.com/doi/10.1002/we.2554) which wikipedia (https://en.wikipedia.org/w/index.php?title=Dunkelflaute&oldi...) cites on this topic says in appendix A

> all the three renewable power generation sources drop below 10% of their capacities for a substantial period of time (approximately ranging from 30% to 50%). Typically, offshore wind power production has a higher capacity factor in comparison to its onshore counterpart. On average, the Dunkelflaute events account for around 7%–8% of the time per year. These numbers do not vary much across the years.

That's a heck of a lot of gas still, and that's ignoring the "intermittency" part (that might mean every day after sunset, not a rare sequence of weather events). But yeah I guess they didn't mean it as an either-or that replaces other storage options