Hmm. I understand the lens from which you are viewing this. I guess (from my economic nerd background) the underlying asset being redeemed in the usage of credit confers to me that you are living on the asset. The dollar is a coupon without an asset so I would say that the Dollar is the muddling/confounding factor not the Bitcoin.
Because assets can use any coupon as currency, using credit (layer 3) to convey dollars (layer 2) that is redeemed for Bitcoin (layer 1) IS using the asset. The coupon (dollars) is the strangest currency because it is not tied to ANY asset nor any pretense of being pegged to one.
Paying your Credit card bill with Gold, oil, or any other hard asset IS living on that asset abstracted by the Dollar and further abstracted by the issuance of credit.
I don't see Jack's framing as disingenuous as saying you live off of any hard asset would imply the use of an exchange medium like currency even if abstracted through credit.
I would say "living off" of dollars is to have no wealth and not really be living off of anything beside perceptive value rather than appreciable value.
So, I get what you mean but on a technical level no one "lives off" of their true wealth by that narrow definition.