Verse 13 continues the current condemnation by declaring the judgement of the Lord. Once again, the previous descriptions were the results of that judgement. In these verses Isaiah is discussing the events and causes of that judgement.
Gileadi’s translation of verse 14 is:
He will bring to trial the elders of his people
And their rulers, and say to them,
It is you who have devoured the vineyard;
You fill your houses by depriving the needy.
The intent of judgement is against those who have created a society that denies the precepts of the Lord. In this case, the elders have neglected their responsibilities to their own people by taking riches to themselves. The devouring of the vineyard is a reference not just to the symbolic consumption of the goods of Judah, but to the predicted famine. Thus the “devouring” of the elders will lead to the predicted famine.