scholar even if modern biblical scholars (and I) are indefinite as to whether the destruction happened in 587 BCE or 586 BCE they (and I) are definite that it did not happen in 607 BCE. They are in agreement that it definitely did not happen any time before 587 BCE and that it definitely did not happen any time after 586 BCE.
Your argument is flawed where you say the following. "How can a calculated precise date of 607 BCE be wrong
when you cannot agree as to whether it is 587 or 586 BCE for the Fall of
Jerusalem? How can it be that a definite date-607 BCE be falsified by
an indefinite date-586 or 587 BCE?" 607 BCE is not a definite year for the destruction, in the sense of it being proven as a correct date by a consensus of biblical scholars. It is only 'definite' in the sense of it being one specific year and in the sense that the WT and many JWs teach it is correct, but those people are not biblical scholars. The governing body of the WT and the other writers of the WT's literature (except maybe for rare exceptions of the Writing Committee) and nearly all of the other JWs did not get a university degree in biblical studies, nor an studies of any middle eastern ancient history, nor in ancient middle eastern languages. Extant archaeological artifacts in no way indicate that the destruction happened in 607 BCE or even in some year within the range of 607 BCE plus or minus 10 years. In contrast biblical scholars have demonstrated a precision of their date to within 1 single year, without having to resort to claims made in biblical prophecies (such as a prophecy in the book of Jeremiah). Instead, the biblical scholars made use of extant historical records which said that it happened during a specific year of a specific king's reign, however the years for the start of a king's reign don't start in the same month as the years of our Gregorian calendar years start in. For a hypothetical example, one year of the reign of a king might have started in March 15, 587 BCE and ended in March 14, 586 BCE (like a fiscal year of a modern day
corporation; for example one whose 10th year of operation was from May 2010 through April 2011, instead of from January 1, 2010 - December 31, 2010). As a result when one reads an ancient document that says an event happened in a specific year of the king (such as perhaps the 19th year of the king), which doesn't also mention the month (or give a clue as to the month), that means that according to our calendar it might have been in the year 587 BCE or the year 586 BCE, in this hypothetical example, according to our Gregorian calendar, but definitely not 607 BCE. That is because in this hypothetical example the 19th year of the king overlapped with parts of two years of our modern day Gregorian calendar.
Consider the following as another example. Someone might say that something happened in either in 400 CE or 401 CE, and definitely not in some other year (such as the year 350 CE). Someone else might say it happened in 350 CE instead. Just because someone might be uncertain as to whether it happened in 400 CE instead of in 401 CE, that doesn't mean they are wrong in being certain it didn't happen in some year which was neither than 400 CE nor 401 CE. It does not mean the one who say it happened in 350 CE is correct.