Those 200 years supply refers to currently known reserves, which is to say, lithium whose location is known, has been proven to be present at a certain level, a

Those 200 years supply refers to currently known reserves, which is to say, lithium whose location is known, has been proven to be present at a certain level, and is economically feasible to extract with current technology. There's lots more lithium out there, there's just not much point looking for or proving its presence yet. That "200 years' reserve" is a small fraction of all the lithium available.