Thanks for pointing this out!
The quotation was referring to ALL the nations that Babylon was conquering, not just Judah:
The savage Babylonian destruction of Jerusalem is well documented both in the Bible (in the books of Jeremiah and Lamentations) and in the archaeological record. When Nebuchadnezzar first placed the city under siege in 597 B.C.E., the city quickly capitulated, thereby avoiding a general destruction. But in response to a revolt by Judah’s King Zedekiah, Nebuchadnezzar dispatched an army that, after an 18-month siege, captured and destroyed the city in 586 B.C.E. The evidence of this destruction is widely confirmed in Jerusalem excavations.a
On his first swing through Judah, Nebuchadnezzar had destroyed much of Philistia—Ekron, Tel Batash, Tell Jemmeh, Ruqeish and Tel Sera‘. Particularly devastated was Ashkelon, which the Babylonians sacked in 604 B.C.E.b
Similar evidence of Babylonian destruction can be found throughout the Beersheba Valley, in the Aravah (the valley south of the Dead Sea) and in the Jordan River valley. From south to north, we can trace the effects of Babylonian might—at Tell el-Kheleifeh on the coast of the Red Sea, at Ein Gedi on the shore of the Dead Sea, and further north at Dan, the source of the Jordan River. The same is true in excavations at major northern sites—Hazor; Megiddo, overlooking the Jezreel Valley; and Dor, on the Mediterranean coast—and in central Judah, where, in addition to Jerusalem, we may look at Ramat Rahel and Lachish, among other sites.
But the strange thing is that above the remains left by these destructions, we find no evidence of occupation until the Persian period, which began in about 538 B.C.E. For roughly half a century—from 604 B.C.E. to 538 B.C.E.—there is a complete gap in evidence suggesting occupation. In all that time, not a single town destroyed by the Babylonians was resettled.1 This is true even of the old Assyrian fortresses along the Way of the Sea (the Via Maris); they were reoccupied only in the Persian period, as shown by the recently excavated fort at Rishon le-Zion.2 The only indications of a Babylonian presence in Palestine are the massive destruction levels the Babylonians left behind. These are indeed impressive, but there is nothing above them that can be attributed to the Babylonian period.
Read what the last paragraph has to say:
It is interesting that in archaeological parlance there is no clearly defined period called “Babylonian.” Indeed, the Babylonian gap is implied by the time charts typically found in Bible handbooks: The destruction of Judah is followed by the Persian period, when, following the eclipse of the Babylonians by the comparatively benign Persians, the Jewish exiles were permitted to return to Palestine.
I do not mean to imply that the country was uninhabited during the period between the Babylonian destruction and the Persian period. There were undoubtedly some settlements, but the population was very small. Many towns and villages were either completely or partly destroyed. The rest were barely functioning. International trade virtually ceased. Only two regions appear to have been spared this fate—the northern part of Judah (the region of Benjamin) and probably the land of Ammon, although the latter region awaits further investigation.13