There is no text in Daniel that says that Neb took Judean captives in his acc year or his first year
A proper chronology of the relevant scriptures places Daniel 1:1 occuring in Nebuchadnezzar's accession year. (As previously covered at lengh, there is no basis for the Society's pretending that "kingship" means something different to "reign" because there is no distrinction in the original text, and other words could have been employed if vassalage was intended.)
and Josephus who sources Berossus clearly states that it was only in Neb's 18th year that he first took such captives beginning the period of seventy years. Also, the re is no cunieform evidence to prove your claim.
Sheesh... that is your defense?? If Josephus did not mention the exile in Nebuchadnezzar's 7th year, then either Josephus simply did not mention all of the exiles, in which case his not mentioning exiles in Nebuchadnezzar's accession year is immaterial... or, you are saying that Jeremiah 52:28 is wrong about exiles in the 7th year.
We justify the claim that the exile that began the seventy years began in Neb's 18th year because that was when the land began its desolation which also was a period of exile or a second exile and a period of servitude for the complete nation deported to Babylon.
(You mean "attempt to justify".) Why would the Jews refer to their exile as a period much shorter than for which most of them were actually there? It is a rediculous assertion.