False. Jeremiah was all about the Exile(s) for it occurs 30 times as listed in the NWT so one can readily see that 'the Exile' was thematic in Jeremiah's prophesying.
It's not that Jerimiah was or was not "all about" the Exile. He talks about it. But he doesn't equate it to the 70 years.
The ch.25 clearly describes the Exile and its consequences of exiles or deportees having to leave a desolated or ravaged landscape and being bonded or made to serve the conquering power, Babylon as other nations also were made to do.
The consequences of the exile is irrelevant to this topic. But again, above, you equate the exile with the servitude. The servitude started long before the exile, and its the servitude that lasted 70 years.
This means that Jeremiah, Ezra, Daniel all described the 70 year period of Exile as also a period of a desolated land, servitude to Babylon during the exile in Babylon.
No, it's literally the opposite.