His Mercy Endures Forever is a Myth because the literal is His Loving Kindness Endures Forever.

Jeremiah 33:10. Thus says the LORD*, Again there will be heard in this place, which you say will be desolate without man and without beast, in the cities of Judah and in the streets of Jerusalem that are desolate, without man and without inhabitant and without beast, 11. the sound of joy and the sound of gladness, the voice of the bridegroom and the voice of the bride, the voice of those who say, Praise the LORD* of Hosts for the LORD* is good: for His loving Kindness Endures Forever for those who bring thanksgiving offerings into the House of the LORD*, for I shall cause the captivity of the land to return as at the first, says the LORD*.