I had heard about the cats in Louisiana, I think I've actually seen a copy of something from a trail cam that definitely was NOT a bobcat.
Today a lot of those farms are abandoned, a lot of areas have been set aside for national forests, and local forests and parkland. Further, the white tailed deer population in the east has skyrocketed. A few generations ago there were very few white-tails in Jersey, and, presumably, other adjacent eastern states. A very aggressive re-introduction program by fish and game agencies increased their numbers and they have spread into areas where they either cannot be practicably hunted, OR public opinion creates such opposition to hunting that it is highly limited or even not permitted at all.
Add together the fact that the eastern U.S. now has a tremendous increase in forest cover, a massive increase in the White tailed deer population, AND the fact that there are breeding populations of cougars in Michigan and other midwestern and western states and cougars have large individual ranges, and it would be surprising if they DIDN'T successfully reestablish themselves in the Jersey Pine Barrens, the Appalachians, the Adirondacks and Catskills and other suitable areas in the East.