Lillianthal wrote that quote.
It is not only possible to trace peoples' DNA back to the Jews of the 12 tribes, but it's done daily as is tracing DNA back through all nations and peoples.
The old notion of "race" that was theorized back in the 1800s which is still held by most people today has been obliterated by Y-DNA testing.
Now, the only "races" are haplogroups. Look it up. It's public knowledge, if not yet common yet. But that doesn't matter. You can't refute the scientific data.