‘scholar’:
Jeremiah also foretold additionally, that the 70 years was of servitude it was also a period of Exile of 70 years during which Judah was desolated for 70 years.
In addition to the response from MeanMrMustard above showing this to be a lie, Jeremiah 27:8-11 also clearly demonstrates that exile was considered a punishment for refusing to serve Babylon, not the way in which Babylon would be served for 70 years.