Yes, the real reason for the vanishing of the Moabites, Ammonites and Philistines is that God’s judgment was against them. To his prophet Ezekiel, Jehovah declared:

therefore thus says the Lord God: See! I am stretching out my hand against the Philistines; I will cut off the Cherethites and wipe out the remnant on the seacoast.”​—Ezek. 25:2-16, New American Bible.

Of the calamity that befell the Philistines, The Interpreter’s Dictionary of the Bible observes:

“Nebuchadnezzar put out any remaining sparks of Philistine independence. He deported both rulers and people, as the mention of the kings of Gaza and Ashdod and the princes of Ashkelon in the lists published by Unger and Weidner has shown.”​—Vol. 3, p. 795.

How forcefully the end of Ammon, Moab and Philistia testifies to the accurate fulfillment of Bible prophecy! The judgment of Jehovah God was indeed carried out against these hard-set enemies of his ancient covenant people, the Israelites. Truly the prophetic Word of God can be depended upon. As we read at Isaiah 55:11: “My word . . . will not return to me without results, but it will certainly do that in which I have delighted, and it will have certain success in that for which I have sent it.”