What does Isaiah 36:13 mean?

Have I come up now without Yahweh against this land to destroy it? Yahweh said to me, “Go up against this land, and destroy it.”’”

Then Eliakim, Shebna and Joah said to Rabshakeh, “Please speak to your servants in Aramaic, for we understand it; and don’t speak to us in the Jews’ language in the hearing of the people who are on the wall.”

But Rabshakeh said, “Has my master sent me only to your master and to you, to speak these words, and not to the men who sit on the wall, who will eat their own dung and drink their own urine with you?”

Thus says the king, ‘Don’t let Hezekiah deceive you; for he will not be able to deliver you.

Don’t let Hezekiah make you trust in Yahweh, saying, “Yahweh will surely deliver us. This city won’t be given into the hand of the king of Assyria.”’

Don’t listen to Hezekiah, for thus says the king of Assyria, ‘Make your peace with me, and come out to me; and each of you eat from his vine, and each one from his fig tree, and each one of you drink the waters of his own cistern;