Once again, I don't know if you are pulling my leg or not but the text's meaning is not dependent upon a translation. The writer is clearly saying Yahweh's anger, denouncement, punishment etc had not ended. It's often assumed his concern was the temple not having been rebuilt as that is what immediately follows.
16Therefore the LORD says this: “I will return to Jerusalem with compassion; My house will be built in it,” declares the LORD of armies, “and a measuring line will be stretched over Jerusalem.”’ 17Again, proclaim, saying, ‘This is what the LORD of armies says: “My cities will again overflow with prosperity, and the LORD will again comfort Zion and again choose Jerusalem.”’
There is no way to misinterpret that. In the mind of Zechariah the "70 years" was just now closing and the reversal of God's disfavor was imminent. It's also quite possible the writer of proto-Zechariah was embittered that while Babylon was technically no longer their master the Achaemenid Empire was. And perhaps to his dismay few wanted to leave their homes and businesses to go to a land they had never seen to start over. Even getting priests to go was a struggle.
But as long as you are obsessed with Babylon, what was supposed to happen at the end of the 70 years?
Jeremiah 25: 12But when seventy years are complete, I will punish the king of Babylon and that nation, the land of the Chaldeans, for their guilt, declares the LORD, and I will make it an everlasting desolation.
Even students of the Bible know that did not happen. Babylon did not suffer destruction, according to Daniel it fell without so much as the gates damaged.