Isaiah Prophesies Concerning the House of Israel, 2 Nephi, 6, 5

Isaiah is not talking about the time of Joseph Smith, nor is the Book of Mormon. There are many things which have been spoken by Isaiah which may be likened to you because you are of the house of Israel. It's all based on analyzing what the scriptures actually say and going by what they tell us,. Not what we try to impose upon them. That is a great lesson I learned in rabbinic school.