The destroyed city was never rebuilt. The walls are not seen today. The mainland walled cities are not found today. A place for the spreading of nets could mean a settlement of fishermen. The walled city of Tyre was turned into a bare rock, so that there was no building of the original city left for rebuilding, and no citizen of Tyre to rebuild it.
Skeptics are slow to show the bare rock on the mainland as the site of Tyre.
Afterall, it is hard to locate an ancient city that had turned into a bare rock. This verse suggests a violent fall with many in pain and some got killed. Coastlands suggest countries and cities along the sea coast where messages could arrive by sea routes. This shows that Tyre was more important by trade at sea than on land. A terrible fall of the city in historic proportion.