The particulars which Ezekiel here foretold actually occurred (compare 2 Kings 25:4; Jeremiah 39:4); but at this time Zedekiah seemed to be prosperous, and the Jews at Jerusalem expected, it is clear, a long continuance of his prosperity (see Ezekiel 17:1 note).
The prophetic character of the passage is undoubted (the prophet is declared to be “a sign,” Ezekiel 12:6) - the genuineness of the book and of the position of the passage in the book, are beyond dispute; in the historical event we have an exact fulfillment. The only legitimate inference is that the prophet received his knowledge from above.