A Little Help, Please?

Sunstone Magazine has an article by Blake Ostler titled, "YEA, YEA, NAY, NAY: Assessing the Logical Structure of DNA Arguments against the Book of Mormon." Unfortunately I don't have a subscription and that particular article is not available online for free.

Will somebody please summarize the article for me in the comments section?

Update: Thanks to Justin for his help. The concepts in the article aren't really new, just laid out nicely. The bottom line is that, using DNA evidence, critics of the Book of Mormon have some strong arguments regarding the "global colonization hypothesis," but in rejecting Book of Mormon historicity they make assumptions that may be unwarranted.