Jehovah’s Witness elders are not Biblical archaeologists, they have no knowledge apart from what the WT has taught them . Indeed, it has been levelled at me that I “ would know nothing without the Society, so why do I dispute what they say?”.
The fact is that nowadays we can find out information in readable forms without a degree in archaeology. Of course we have to guard against false information, but that can usually be spotted and when subjected to a group such as ours , falsehoods are called out.
JWs are not permitted to read contradictory information. The video correctly showed the attitude. JWs just trust the Society. Of course the Bible does not give a BCE date for the fall of Jerusalem ,it is calculated by men .
What the Bible does say is “ Do not put your trust in nobles nor in the son of earthling man” (Ps. 146 : 3) NWT .