Not sure what this person meant. They said I must think the Jewish excile occurred before the temple was burned. After also trying to claim there was another king no one knew about until 100 yrs ago (Belshazzar?), they also tried to say the Bible supports 70 yr. excile, but if the fall of Jerusalem happened in 586/7, then that would mean the Jews were exciled for 47 yrs., not 70.
Jews were exiled in 597 BC, long before the destruction of the Temple in 587/6 BC. Ezekiel dates his exile from this date throughout his book, and ch. 25-29 of Jeremiah presume an exile already in progress. It is certainly not an exile that doesn't start until some point later. The MT, which the Society accepts as authoritative (which is not necessarily the oldest form of the text), has the seventy years as a period of servitude for "all the surrounding nations" who "will serve the king of Babylon seventy years". Chapter 25 in the MT version of the text is dated to "the fourth year of Jehoiakim son of Josiah, that is to say, the first year of Nebuchadnezzar king of Babylon" (v. 1), which is when that servitude began for the nations around Judah, and the oracle implies that the period of servitude began around the time the oracle was given: "I will summon all the peoples of the north and my servant Nebuchadnezzar king of Babylon and I will bring them against this land and its inhabitants and against all the surrounding nations.... These nations will serve the king of Babylon seventy years. But when the seventy years are fulfilled, I will punish the king of Babylon and his nation, the land of the Babylonians for their guilt...For twenty-three years, from the thirteenth year of Josiah son of Amon, king of Judah, until today, the word of Yahweh has been addressed to me and I was persistently spoken to you but you have not listened ... So, this is what Yahweh Sabaoth says: Since you have not listened to my words, I am summoning all the clans of the north and my servant Nebuchadnezzar king of Babylon and bring them against this land and its inhabitants and all these surrounding nations" (v. 3, 8-12).
The pamphlet to the exiles in ch. 27-29 (again in the MT) presumes that the exile was already in progress. At the beginning of the reign of Zedekiah, Jeremiah proclaimed this message:
"Send word to the king of Edom, the king of Moab, the king of the Ammonites, the king of Tyre, and the king of Sidon, through their envoys accredited to Zedekiah, king of Judah in Jerusalem... Give them the following message, 'Yahweh Sabaoth, the God of Israel, says this: I by my great power and outstretched arm made the earth, man and the animals that are on the earth. And I can give it to whom I please. For the present, I have handed all these countries over to Nebuchadnezzar king of Babylon, my servant; I have even put the wild animals at his service. All the nations will serve him, to his son, and to his grandson, until the time for his own country comes in its turn, when mighty nations and great kings will enslave him. Any nation or kingdom that will not submit to Nebuchadnezzar king of Babylon, and will not bow its neck to the yoke of the king of Babylon, I shall punish with sword, famine, and plague" (v. 3-8).
Clearly, these surrounding nations were already handed over to Nebuchadnezzar by the time of Zedekiah's accession, and they will remain subject to him "to his son, and to his grandson, until the time for his own country comes in its turn, when mighty nations and great kings will enslave him". This is a clear parallel to 25:11-12, where the 70 years corresponds to the three generations mentioned here and the reference to God punishing the king of Babylon in 25:12 corresponds to the enslaving of Babylon by "mighty nations and great kings" here. All of this cannot be reconciled with the Society's interpretation.
Note that this was after the siege of Jerusalem in 597 BC, in which the king carried off both Temple vessels and exiles to Babylon (27:18-22). Jeremiah urged King Zedekiah to "bend your necks to the yoke of the king of Babylon, submit to him and to his people and you will live" (v. 12). Meanwhile, the false prophet Hananiah declared that Yahweh "has broken the yoke of the king of Babylon. In two years' time I will bring back all the vessels of the Temple of Yahweh which Nebuchadnezzar king of Babylon carried off from this place to Babylon. And I will also bring back Jeconiah son of Jehoiakim, king of Judah, and all the exiles of Judah who have gone to Babylon" (28:3-4). Again, the period of servitude, the time when "these nations serve the king of Babylon for seventy years" (25:11), had already begun, for God says that "I have handed all these countries over the Nebuchadnezzar king of Babylon ... all the nations will serve him, to his son, and to his grandson until the time for his own country comes in its turn".
Finally, ch. 29 includes the text of a letter that Jeremiah sent to the exiles already sent to Babylon, and he encourages them to settle down there, to take wives and have sons and daughters and then find wives for their sons (thereby indicating the passage of generations), for they were not going home anytime soon: "Only when the seventy years for Babylon are over, will I visit you and fulfill my promise in your favor by bringing you back to this place" (v. 10). Here Jeremiah refers to the seventy years as a period of time that Yahweh granted to Babylon, the time when "all the nations will serve Nebuchadnezzar king of Babylon, to his son and to his grandson" (cf. 27:7). Notice, again, that in 29:10 the 70 years do not lie in the future, for they are not waiting for the 70 years to begin but for them to be completed. The Watchtower interpretation again goes against the context.