the context of Jeremiah 25: 9-11 is about the deolation of the land becoming a devastated place, an object of astonishment for seventy years. In order for this to occur the people of tha land would also suffer punishment as exiles in servitude to Babylon. Tjis pasage proves that the seventy years has as its primary focus desolation of the land with the people exiled in servitude for that same paeriod of seventy years.
You state this as if it is true. However your statement simply cannot be reconciled side by side with the verses in question using any interpretation of the words employed in the passage. Your implication that the verse refers specifically to Jewish exile is flawed. Jeremiah 25:9-11:
9 here I am sending and I will take all the families of the north,” is the utterance of Jehovah, “even [sending] to Neb·u·chad·rez´zar the king of Babylon, my servant, and I will bring them against this land and against its inhabitants and against all these nations round about; and I will devote them to destruction and make them an object of astonishment and something to whistle at and places devastated to time indefinite. 10 And I will destroy out of them the sound of exultation and the sound of rejoicing, the voice of the bridegroom and the voice of the bride, the sound of the hand mill and the light of the lamp. 11 And all this land must become a devastated place, an object of astonishment, and these nations will have to serve the king of Babylon seventy years.”’