It can work - usually when I go to Brazil I just use my DNI extranjero to enter and leave, usually they only question is where I traveling to or from as you can only use it to enter and leave the country when traveling to or from neighboring countries. Also works at land borders like this.Works, of course, only with Argentine citizens. If you have a DNI extranjero, this will not fly (no pun intended).
Rarely they ask for my passport too but since I have a few of those and most places I go don’t stamp them, there is no way to know where I was before Brazil (for example) Only one time was I asked “just Brazil?” when responding to the where are you going question.
LATAM Chile, Peru and Brazil have a loooot of pre-existing frequencies so would see no reason now they are suddenly not approved or revoked since we are in theory back to schedule.