Name hope vs. islands law

[IPOstapyuk]

I am reading a book called "Two Bibles - two ways" in pdf format.
It says about Masoretic text and the Septuagint.
The author did thorough calculations of Bible chronology.
So, it appears that according to Septuagint the Babylonian captivity started
5500 - 4913 = 587 years B.C.
but according to Masoretic text:
3753 - 3527 = 226 years B.C.
Masoretic chronology does not correspond to the world history.