Dan Wees:

“Do you find the mention of the ‘five books of Moses’ in 1 Nephi 5:11 to be anachronistic?”

Dan Vogel:

“The problem is Deuteronomy is a forgery that was pretended to have been found in the temple walls after the Jews returned from Babylon. This was obviously long after Lehi left.”

Instant Messages, 9 February 2017

Wikipedia:

“[T]hat the book was a forgery created to help centralize power under Josiah, is held today among some Biblical scholars.”