‘scholar’:
The fact is that Daniel refers to a period during Neb's reign in which he was vacant from the throne. This period is accepted to be a literal seven years that must be factored in any scheme of Neb's reign for Chronology. The period must be inserted after Neb's 19 th year-607 BCE and before the end of his reign so you have much to play with.
Restating the claim made in the story is not a valid response to the question. It just reminds us that you don’t understand the period or context in which Daniel was written. But the point is well made… you have no stable chronology of the neo-Babylonian period.
586 or 587 BCE are bogus dates for the Fall of Jerusalem. Since 1975 when A.K.Grayson published his translation of BM 21946 scholars remain uncertain about which date either 586 or 587 is correct. Currently, the said scholar would propose that it is an even split between both candidates. Further, confusion remains about the methodology surrounding such a contention.
And you’re wrong.