Does it permanently condemn the land as too toxic be used for anything? Or can that all be cleaned up?
If you're the one making claims its on you to provide sources. If you're just saying things and putting question marks on the end people are going to treat it the same way they treat newspaper headlines, which is to say any headline ending in a question mark probably has an answer of no.
I read this as asking questions not making claims.
As the only post of an account created less than an hour ago, I lean towards it being more likely a bad faith attempt at trolling than an honest inquiry.
It was clearly a combative "question", and entirely orthogonal to the topic under discussion, which was the accuracy of the claims about the scarcity of lithium.
It would have been entirely within the guidelines of polite discussion (and the site) to point out that scarcity isn't the only deciding factor, but the OP never made any assertions to that effect.
It's worth reading an article about "just asking questions" as a bad faith debating tactic if you haven't heard of it before. Here's a random article about it: https://rationalwiki.org/wiki/Just_asking_questions
With that phrasing? No way.
As an aside, Betteridge's law of headlines, to the extent that it has been studied, appears to be incorrect. The answer is slightly more likely to be yes.