Yes, I've read the blurbs. There is no way to genetically identify a unique descendant of Aaron in any biblical sense. Thousands of years of intermarriage have dispersed the genes among the nations. If a Jews converted to Christianity 1500 years ago his descendants would have all the right genes, yet they would be Christians.
It's a pipe dream for a desperate population. The only true hope is for people today to come to Messiah Jesus, regardless of their ethnicity. Then they can be counted among the true children of Abraham and regrafted into the covenantal root, where there is neither Jew nor Greek.