The deeper question is ‘Are American Indians descended from Abraham? ... Should we ping the Mormon brigade at BYU using serrogates at FR to refute something claimed by Joe Smith now?
Oh, like THAT would be the straw that broke the camels back. They need to get real. There is no evidence that anything in the Book of Mormon is anything more than (to quote Mark Twain)...
“...merely a prosy detail of imaginary history, with the Old Testament for a model; followed by a tedious plagiarism of the New Testament.” Mark Twain
No linguistic data, no archaeological data, no cultural data, no historic data, no genetic data. It is a perfect record of absolute non-conformance to reality.
Luckily Mormons are good people and good Conservatives and don’t dwell much on their silly theology; they are too busy being Mormons.