My biggest problem with all of that is it doesn't line up with the age indicated in the Bible.  If you use the genealogies that say what age the father was when each son was born, the Earth is only about 6,000 years old and the flood was approximately 4,500 years ago.  None of the dates in that book agree with Biblical ages.

FYI, we can't know exact years because we don't know if someone was born on the first day of after a birthday or one day before they turned the next age.  Also the Jews used to use a 360 vs 365 day year.  I've also heard that they used to name ages solely based on the year of birth, so that causes weird rounding errors.  Still, we should be able to get within 100 years of the right year.  That doesn't allow tens of thousands of years, not if you believe the Bible is true.