In Bible and Interpretation, Philip Davies writes
We can quibble about whether the Shephelah is “Judah” rather than the highlands, but that this part of Palestine and this city were part of a political system called “Judah” is quite another supposition. Where is the proof? I suspect Garfinkel is just using a biblical figure to fill the gap. If so, we have just another example of the old “biblical archaeology.”
Enjoy it all.