The challenge with interpreting statements like this is that there isn't just one lithium battery chemistry in widespread use, and even within a single chemistr

The challenge with interpreting statements like this is that there isn't just one lithium battery chemistry in widespread use, and even within a single chemistry the detailed structure of the anode and cathode can greatly change both achievable charge/discharge rates and longevity. For example, compared to the most commonly available energy-storage-optimized NMC cylindrical cells, LTO cylindrical cells charge and discharge at rates up to 10x faster, and have an estimated lifetime of tens of thousands of cycles... in exchange for have half or less of the energy density. Which is to say, depending on the exact details of the sodium cells being discussed, it's extremely likely that their entire performance envelope is achievable today with some combination of NMC, LFP, and LTO cells; although they may yet prove to have a cost advantage.