But neither the United States nor any State shall assume or pay any debt or obligation incurred in aid of insurrection or rebellion against the United States, or any claim for the loss or emancipation of any slave; but all such debts, obligations and claims shall be held illegal and void.

1. Reparation = out of the window.
2. Insurrection or Rebellion =>

I would consider no 2 the most viable road for Dave's claim IF, and the evidence is quite clear, supposing it clears the bar of reasonable doubt, this whole matter is viewed through the lens of the war against the City of London.

Then all of a sudden, it makes perfect sense, and it goes way back ...It could be argued, back to any President assassinated who would dare change the debt slave system.

I would add though there is a corollary:

The Congress shall have power to enforce, by appropriate legislation, the provisions of this article.