It's different. Usd is the world currency of exchange. Pesos, Bulivars etc... aren't.
It will only defult when every nation stop trading in dollars. Untill then, they will always print more money withou consequences for themselves.
Discussion
That only eliminates the default through outright nominal default. If you read carefully, other possibilities for default are mentioned (devaluation, inflation, restructuring) which are very likely for the US.
Don’t be the “this time is different” guy