This article is proposing a way to improve a different battery technology (Lithium-metal) which is not now useful for EVs because it loses capacity too quickly.
That was my first thought. I always heard that you cannot totally discharge lithium Ion batteries with out destroying them and possibly even having them catch fire if you try to charge them at that point. There is a reason why your cordless tool will just stop working when the battery is low. It will not slowly die like the N-cads. They are designed to cut off the load when they are discharged to a certain point.