Stock price when the opinion was issued
The energy transition from fossil to renewable takes time. That's the reality. There's plenty of lithium in the world, but how quickly can we get it to market? The market was surprised by how quickly brine mining in Chile. Also, people aren't buying EV's as quickly as the market expected. Lithium is close to the bottom, so the risk/reward looks good. He doesn't buy ETFs for his clients, but owns SQM and Albemarle.
Longer term, this will probably balance out. But lithium market had significant changes in the last year, and that's why you keep tabs on your portfolio more than just once a year. Reduction in lithium prices due to weak demand and over-supply. Back away.
Remember that these "explore" ideas are not "core". Smaller positions with stop losses.