I was under the impression that historians don't consider including people who live for over 900 years in genealogies indicative of accuracy....
There is no secular history from before the flood. There is no record of anyone after the flood living that long. It really doesn’t matter what modern day historians consider accurate. They thought the Bible was inaccurate when it spoke of the Hittites. No one had ever heard of the Hittites before and then after the discovery they realized that the Bible knew something that no one else had record of previously.