Any analysis that uses lithium batteries as the reference storage technology gives at best an upper bound on cost. More often it signals incompetence or bad faith.

Real utilities will rely on whatever storage is cheapest at the time they need to build it. Batteries will remain among the most expensive storage, but are good for load-smoothing.

Synthetic fuels cost more, but have desirable externalities: utilities can sell excess production. Those costs are falling fast, too.