No, that is not a typo, nor are we referring to the “many dwelling places” in heaven.
Now, there are indeed promises given in scripture so plainly that only unbelief can cause us to miss the benefit of them. For example, in Old Testament times God showed his care for Abraham, the “father” of those who believe, by condescending to put himself under oath. The writer to the Hebrews tells us that “when God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he guaranteed it with an oath, so that by two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement to hold fast to the hope set before us.”