No, it would not be reclaiming states land from the feds, assuming my recollection of history is correct.
Take for example the Louisiana Purchase. The federal government bought the land outright. The federal government owned it. Period.
Then came the homesteaders, applying for land from the feds, proving it up, and getting it. Farms were formed, townships were formed, cities, then boundaries were created for states and they applied for statehood.
As a result, several states were formed within the Louisiana Purchase.
My point is, whatever land that was never homesteaded or given to a state was originally and still is federal property.
Right?
What these people want to do is get more land from the feds.
Then, just as a matter of headline accuracy, the use of the word reclaiming would be inaccurate.