Jeremiah declared that they were to wear the yoke of servitude for seventy years; and the captives that were already in the hands of the king of Babylon, and the vessels of the Lord's house which had been taken, were also to remain in Babylon till that time had elapsed. But at the end of the seventy years God would deliver them from their captivity and would punish their oppressors and bring into subjection the proud king of Babylon. 4T 169.1 Ambassadors came from the various nations named to consult with the king of Judah as to the matter of engaging in battle with the king of Babylon. But the prophet of God, bearing the symbols of subjection, delivered the message of the Lord to these nations, commanding them to bear it to their several kings. This was the lightest punishment that a merciful God could inflict upon so rebellious a people, but if they warred against this decree of servitude they were to feel the full rigor of His chastisement. They were faithfully warned not to listen …
"And this whole land shall be a desolation, and an astonishment; and these nations shall serve the king of Babylon seventy years."
The EGW passage directly references and quotes Jeremiah 25:11 regarding the seventy years of servitude in Babylon.