What's Happening in Second Nephi 27?

Joseph Smith reads the Bible a lot, spends a lot of time in Isaiah. He's familiar with this chapter in Isaiah 29 talking about a sealed book and delivering of words. And so when he's finishing the Book of Mormon and writing in Second Nephi, which we now know was written towards the end of his translation process, because the 116 pages had been lost, he writes into his Isaiah plagiarism basically. "He basically does some Isaiah fan fiction and back dates a prophecy from Isaiah to Second Nephi that his shenanigans with Martin Harris and Professor Anton are going to happen"