Except that much higher inflation will force higher UST coupon rates or even higher levels of money printing to buy them to suppress the coupon rate below what a free market would set them at, as already the US government cannot afford to let UST rates operate according to a free market.

Higher inflation and interest rates rapidly compound the nominal amount of the debt.

Default can probably be held off until Trump exits the building but probably not long beyond that.
Trump is Ideocracy made real...including many economically illiterate observers buying the trashy Trumpian rationalizations.