ScenicViewer,
Have a look at the Italian site; there is at least one English passage that is directly cited.
I touch on the subject (in English) at pages 22 to 24 of my study at:
http://www.jwstudies.com/Onscreen_Critique__October_Watchtower__Jerusalem_Destroyed.pdf
The problem is for the WTS to PROVE that the Jews exited Judah in the same year when Jerusalem was destroyed. There is no agreement on the time from the destruction to the entry into Egypt. For example, the Jewish Encyclopedia acknowledges the range of views, from two months (tradition only) to 4 years:
"The rule of Gedaliah lasted, according to tradition, only two months, although Grätz argues that it continued more than four years." http://www.jewishencyclopedia.com/articles/6548-gedallah
The WT cannot prove the year when the Jews entered Egypt and they cannot PROVE the year that the first exiles returned to the site of the destroyed temple at Jerusalem. They cannot prove that it happened in 537; because there is no positive evidence, there is a wide range of views, as can be seen by Googling:
jews return 538
jews return 536
jews return 535
Doug