until these get produced for real in mass quantities, they are vaporware
The world is already seeing exponential growth in annual completion of grid scale battery storage. Here's some recent data in the US, as products and projects mature from theoretical to small scale prototypes to full scale pilot projects to full production.
And author should compare winter moths
There's also significant developments being made in geothermal, which is actually dispatchable. Plus we actually still produce more grid-connected wind than solar right now, it's just that solar is so damn cheap it makes sense to install capacity well beyond matching peak demand.
Some combination of overcapacity, demand-shifting, and storage will go a long way in reducing the amount of dispatchable fossil fuel capacity that is necessary.