My interpretation is that when they say they have added acres it...

My interpretation is that when they say they have added acres it means they have acquired the Li rights (not sure about other minerals, not important IMO).
But then they have to lease the old exhausted oil wells, and that's where the deal for exclusive rights to the State's ownership records is important. Over many years ownership of wells has changed and fragmented (inheritance etc). The claim is it's very difficult to establish actual ownership without the Govt. records, and that is where PFE has an advantage over the 50,000 acres.
I reckon part owners of forgotten wells might be quite ready to accept an offer by mail of a few grand a year, maybe !! ??

But first PFE needs to do a test at their sample well site, and prove the economics.

I'm impressed by the recent ann - if EXXON wacks a well on our border it means something - are there gentleman's agreements about that kind of stuff? Maybe just disclosure of flow rates and grade etc?

Anyway it looks like we may be doing DLE from Smackover brine much sooner than most holders thought.

IMO - not advise, not qualified.