Sorry that was never ever the prediction . You need to read the story. It was a prediction about a Nebuchadnezzar and no one else. It would help if you knew the history of Tyre. It had a history of being attacked and overrun in the past. That is why it was heavily fortified. Guess what happens when an island is attacked fairly often? It loses now and then. It is hardly a prediction.
This is a problem for believers in prophecy. Either the prophecies in the Bible fail quite often. Or they have to be diluted to the point where they are worthless.
Can you answer this question: Are the prophecies worthless themselves or are there some seriously failed ones?
Even if you don't believe that Alexander the Great attacked Tyre, there are other prophecies in the Bible that were fulfilled. Biblical Prophecies Fulfilled
BIBLICAL PROPHECIES FULFILLED
There are two extensive prophetic themes in the Old Testament: the inspired record of God's covenant with Israel; and His guidance in it. Both of these themes were given to the various prophets from Moses (B.C. 1500) to Malachi (B.C. 400). One concerns God's people of old, the Jews and their history to come; the other the Lord's Messiah. Messiah (Hebrew) or Christos (Greek) means "the anointed one" or, in modern terminology, the ruler priest. No other subject receives such important attention in God's sight as these themes. Let us begin with the prophecies concerning Jesus. For the sake of brevity only some have been selected:
Some prophecies regarding Jesus
Prophecy of Jesus' birthplace and pre-existence ± B.C. 700:
"But you, O Bethlehem Ephrathah, who are little to be among the clans of Judah, from you shall come forth for me one who is to be ruler in Israel, whose origin is from of old, from ancient days." (Micah 5:2).
Fulfilment:
"And Joseph also went up from Galilee, from the city of Nazareth, to Judea, to the city of David, which is called Bethlehem, because he was of the house and lineage of David, to be enrolled with Mary, his betrothed, who was with child. And while they were there, the time came for her to be delivered. And she gave birth to her first-born son and wrapped him in swaddling clothes, and laid him in a manger, because there was no place for them in the inn." (Luke 2:47).
Prophecy of the virgin birth, divinity and unique sonship ± B.C. 700:
"Therefore the Lord himself will give you a sign. Behold, a young woman shall conceive and bear a son, and shall call his name Immanuel. (= God with us) (Isaiah 7:14).
"For to us a child is born, to us a son is given; and the government will be upon his shoulder, and his name will be called 'Wonderful Counsellor, Mighty God, Everlasting Father, Prince of Peace.'". (Isaiah 9:6).
Fulfilment:
"Now the birth of Jesus Christ took place in this way. When his mother Mary had been betrothed to Joseph, before they came together she was found to be with child of the Holy Spirit; and her husband Joseph, being a just man and unwilling to put her to shame, resolved to divorce her quietly. But as he considered this, behold, an angel of the Lord appeared to him in a dream, saying, 'Joseph, son of David, do not fear to take Mary your wife, for that which is conceived in her is of the Holy Spirit; she will bear a son, and you shall call his name Jesus, for he will save his people from their sins.' All this took place to fulfill what the Lord had spoken by the prophet: 'Behold, a virgin shall conceive and bear a son, and his name shall be called Emmanuel' (which means, God with us). (Matthew 1:18-23).
Prophecy concerning the time of his coming ± B.C. 520:
"Seventy weeks (of years, i.e 70 x7 years = 490 years) are determined upon thy people (Daniel's people = Jews) and upon thy holy city (Jerusalem), to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy (i.e. no more prophetic revelation added to the Bible after that), and to anoint the Most Holy (anoint = exalt, crown, dedicate). Know therefore and understand, that from the going forth of the commandment to restore and to build Jerusalem (which at that time was destroyed and its inhabitants were captives in Babylon) unto the Messiah, the Prince, shall be seven weeks (49 years) and sixty-two weeks (434 years): The streets shall be built again, and the wall, even in troubled times."