I am reminded of the Mormon researcher at BYU who found out that because of DNA, the Native Americans could have not been Hebrew.
He probably means Simon Southerton, who was a former-Mormon researcher in Australia (not BYU). He wrote a book in 2004 entitled
Losing a Lost Tribe: Native Americans, DNA, and the Mormon Church, which is about how the DNA evidence contradicts the claims in the Book of Mormon.
I speculate that it's Southerton who Bill is referring to, since after the publication of his book, the LA Times
published a major article about DNA evidence and Mormonism.
The LDS Church had to find a way to brush this aside. They tried their "anti-Mormon" smear on this faithful Mormon.
Southerton actually left the church voluntarily in 1998, long before he wrote and published his book. He was officially excommunicated in 2005. The LDS church said it was over an adulterous affair that Southerton doesn't deny, but Southerton says the adultery charge was basically an excuse to excommunicate him over his book while avoiding talking about it.
Another scientist who spoke about how scientific evidence contradicted the Book of Mormon as well as the issue of racism in the LDS scriptures, Thomas Murphy (this time a practicing Mormon) was apparently threatened with excommunication if he didn't recant, though the proceedings were dropped without Murphy backing down from his position at all. See Item 8 at
this page.
As for the response of the actual BYU scientific community, you can read
this collection of essays hosted at the BYU's Neal A. Maxwell Institute.
Needless to say, the issue of Mormon scientists (even BYU scientists) regarding DNA evidence vs. their religious beliefs isn't nearly as black and white as Bill would have everyone believe.