Rocketman123
When you closely examine the events concerning the ancient Israelites of that era and that of the inhabitants of Jerusalem, it clarifies the difference of servitude, desolation and exile.
---
Historically and theologically there is no difference between the three elements of the 70 years namely exile-desolation -servitude which is an exact description of what Jeremiah foretold, witnessed by Daniel and Ezekiel, confirmed by the historians Ezra and Josephus.
---
There was a lot of historical subsequent of events which happened to the inhabitants of Jerusalem by the hand of Nebuchadnezzar from the beginning of servitude to him right to their return from exile which JWS are dishonestly dismissive about .
---
Exactly and that is what you should pay attention to that detailed history in the Bible and not try to harmonize with NB Chronology.