One of the claimed benefits of sodium based batteries, that I remember from the press statements of CATL, is that they don't burn, even when you but them in a f

One of the claimed benefits of sodium based batteries, that I remember from the press statements of CATL, is that they don't burn, even when you but them in a fire. The also should work in a wider temperature range, which is especially interesting for cold regions. In the article it says, that they are using a "patented Prussian blue". Isn't CATL also using Prussian blue in their first generation sodium batteries?