OK.

I am absolutely sure there are Jews today that can trace their lineage all the way back to King David through someone other than Jehoiachin aka Coniah? With that said, if the future Messiah/King descending from another line other than Coniah, would in fact be a legitimate descendent to sit on the Throne of David, then what was the whole point…the relevance of God saying the following?

I am trying to understand things from your perspective!
Why will he and his children be hurled out,
cast into a land they do not know?
29 O land, land, land,
hear the word of the Lord!
30 This is what the Lord says:
“Record this man as if childless,
a man who will not prosper in his lifetime,
for **none of his offspring will prosper,
none will sit on the throne of David
** or rule anymore in Judah.”