The narration is spoken by another person, not Buffett, so there may be a question of credibility in this reference, (below-YouTube).
There are varying concoctions in relation to the materials used in solid-state batteries, (Wikipedia) however, these have not appeared on a commercial scale at this point in time.
As far as Toyota and solid-state batteries are concerned, these batteries may use more lithium, (below-Carboncredits) as opposed to any suggestion that Toyota uses no lithium at all.