This article is about a sodium-ion battery which is a different chemistry to the one BYD claimed those results on (that was LFP).

Sodium-ion is exciting because it has the potential to have less degradation over time, much less sensitivity to cold and less reliance on rare earth metals. Could also end up significantly cheaper. However it has struggled to reach the same energy densities and so hasn’t been practical thus far.

This seems like a big step towards it being a practical technology choice for certain models, if it bears out.