Look at the graph in the article. The trend is clearly log-linear at the tail end in 2024, which is to say, still dropping exponentially. People said the same thing about solar for years, of course. Exponential decreases in cost are apparently hard for people to reason about. As others say in adjacent comments, there's lots of lithium around, and lots of promising work on salt based chemistries for mass storage. Plenty of room for progress.