I get what you are saying but the point of my comment - and I see why it didn’t come off this way - is that it won’t be 8.5% for a decade, so no, buying a treasury bond is not -5.5%. To emphasize this point, I said we’d have a lot worse problems because for it to be true the US would be experiencing an unprecedented economic catastrophe.
I'd say that yes, we have a much bigger problem on our hands than the relative yield of a treasury bond.