Ensign, January 1992, pg. 22; “From his mother’s account, we know that the visions Joseph experienced while receiving Moroni’s instructions must have been vivid. She wrote: “During our evening conversations, Joseph would occasionally give us some of the most amusing recitals that could be imagined. He would describe the ancient inhabitants of this continent, their dress, mode of travelling, and the animals upon which they rode; their cities, their buildings, with every particular; their mode of warfare; and also their religious worship. This he would do with as much ease, seemingly, as if he had spent his whole life with them.” (Biographical Sketches, p. 85.)”
Leviticus 19:31; “Regard not them that have familiar spirits, neither seek after wizards, to be defiled by them: I am the LORD your God.”
The timeline is what’s important here. Luck Mack Smith stated her son Joseph Smith, Jr. was telling these stories when he was roughly 18 years old. Smith didn’t receive the plates for “translation” until he was 23 year old. How did he know what they were about some 5 years before receiving them from the angel of light Moroni?