Original information source, not the tweet: https://www.usgs.gov/news/national-news-release/lithium-eastern-states-could-replace-imports-a-century-or-more

And the Study: https://link.springer.com/article/10.1007/s11053-026-10652-9

There is a very important sentence all the way at the end:

The USGS did not assess what amount would be economically recoverable.

Edit: On a second reading, I think this sentence applies only to the southwest Arkansas brine deposits. Sorry.