"But I am Yahweh your God from the land of Egypt. I will yet again make you to dwell in tents, As in the days of the solemn feast.
What is promised here is that Israel shall again dwell in tents, not for a few days, as in the feast, but permanently.  God will again reduce the nation to poverty, slavery, and deprivation, because they forgot the Lord and walked in wicked ways.