Anyways, I expect this one is the latter. It seems the general method is to elecrolyze seawater with a special membrane (lithium lanthanum titanium oxide (LLTO)) and special electrodes (ruthenium and platinum) that only allows lithium ions but not other metals through. "Five dollars of electricity is needed per kilogram", hey that's pretty good. Not so good: did you notice the phrases "seawater", "special membrane", and "special electrodes" in the same sentence? Yeah, that means $$$$$. The quote on that little detail? "His team also aims to enter a collaboration with the glass industry, to develop the LLTO membrane at greater scales with affordable cost." Mhm.
But hey, I'm just an idiot that took a chemistry class way back when and my first paragraph was cast at this article unfairly. Maybe we'll be lucky and get one of those awesome HN moments where an expert in the field chimes in, otherwise I hope to see you in 5 years with another headline claiming that this tech was finally commercialized. And good luck to the team! Just don't hold your breath.