That map seems a bit off from my knowledge of NFS lands in Mich. and in Nye County, Nev.
I could likely find more "anomalies" should I spend more than 10 sec reviewing same.
1. government owning land is socialism/communism
2. the U.S. federal government own this much land (most of the West and up to 86% of the land in Nevada alone) is monstrous .and repeal of that ownership should be a top issue. but the media hides this
3. Texas does seem to have the most private land. this is why it's the most prosperous and free of the states: