While the WTS clearly has false teachings, they fundamentally claim to always go by the Bible when there is a conflict between the Bible and secular history. That is a position of a "Biblicalist." Olof Jonsson is not a Biblicalist. So some who have left the organization and been impressed with his evidence against 607 BCE don't realize this simply reflects revised documents that promote a false timeline.
In this sense this is a very Freemasonry type scenario where two false teachings are set up against each other while the one true scenario is not part of the debate. Thus in this case it seems the WTS and Olof Jonsson are on opposite sides of the fence but they both agree on one false date, which is 539 BCE, the fall of Babylon. This is not in agreement with the Biblical dating for that event in 462 BCE.
So in the Bible vs Jonsson vs WTS debate, the WTS is going to win some and Jonsson is going to win some. For instance.
1. Jonsson is absolutely correct that Daniel was deported in the accession year of Neb2, whereas the WTS tries to create a complicated timeline reference denying this chronology. I'm not sure why.
2. Jonsson promotes the VAT4956 as a key text in dating the NB Period and year 37 of Neb2 to 568 BCE. But in this case the WTS is correct in noting that this document is over 200 years past this event and is created during the Seleucid Period and thus whiel the astronomical information is accurate for 568 BCE, the historical reference to year 37 of Neb2 cannot be trusted. That's absolutely correct. A text like the VAT4956 cannot be used to challenge contemporary materials.
3. But Jonsson is correct as well in noting this same dismissal of the VAT4956 by the WTS would apply to their own astrotext cited, the Strm. Kambyses 400 to date the return from Babylon in 455 BCE and the fall of Babyon in 539 BCE. Jonsson is correct that if you legitimately dismiss the VAT4956 as noncontemporary the same would apply for the WTS promoted SK400.
4. The Seventy years of desolation. The WTS has a firm basis in 2 Chronicles 36 to establish a literal 70-year period ending the 1st of Cyrus when the land was desolate. Likewise, Jewish history via Josephus acknowledges this well-establish 70-year desolation period. Jonsson has to dismiss both the Bible and Josephus regarding this historical period so he fails to overcome this Biblical reference though his attempts reach near desperation to have this applied to Babylonian servitude. If the Jews themselves interpret the 70 years to be literal there is little you can do to overtrun that, academically.
LS