Deportation to Babylon

What is meant by “deportation to Babylon” (Matthew 1:11)?
After God blessed the Jews into a great nation, they decided that they didn't need Him anymore, and led by a series of wicked kings, worshipped pagan idols as gods, even burning their own babies as human sacrifices, engaged in other abominations, and rejected repeated warnings from prophets to repent and turn back to God. In response, God destroyed the northern kingdom of Israel and sent it into exile in Assyria in 722 BC, and then destroyed the southern kingdom of Judah and sent it into exile in Babylon in 586 BC during the reign of Jeconiah, who was also known as “Coniah” and “Jehoiachin” (Jeremiah 52:31): 24 “As I live,” says the LORD, “even if Coniah the son of Jehoiakim, king of Judah, were the signet ring on My right hand, I would still pull you off; 25 and I will give you into the hand of those who seek your life, and into the hand of those whose face you fear - the hand of Nebuchadnezzar, king of Babylon, and the hand of the Chaldeans. 26 And I will cast you out, and your mother who bore you, into another country where you were not born, and there you shall die. 27 They shall not return to the land to which they desire to return. 30 Thus says the LORD: ‘Write down this man childless, a man who shall not prosper in his days, for none of his descendants shall prosper, sitting on the throne of David and ruling anymore in Judah’ ” (Jeremiah 22:24-27, 30).

What did God mean by Jeconiah being “childless” (Jeremiah 22:30)?
Not that he won't have any descendants but that they won't prosper to continue the royal line: “for none of his descendants shall prosper, sitting on the throne of David and ruling anymore in Judah” (Jeremiah 22:30).