@Rocket:
The land finally enjoyed its Sabbath rest, lying desolate until the seventy years were fulfilled, just as the prophet had said.
Until the seventy years were "fulfilled". Until the 70 years were completed - as in the 70 years had already begun. The "servitude" spoken of by Jerimiah started before the destruction, and continued during exile, until it was finally "fulfilled". And when it was finally completed, Babylon was brought to account. That's the Biblical order. It matches history well. It doesn't match WT chronology.