He has to unwind massive government entitlements to stave off a full economic collapse. Argentina is not the US where they can print and borrow endlessly. He came into office with over 200% inflation. An economy can’t function like that forever.
He isn’t just slashing indiscriminately and I don’t see anyway for Argentina to dig it self out of 40 years of irresponsible spending in the 2 months he has been in office. Also remember that he has to forge a coalition with others to get anything done. His party doesn’t have anywhere close to a majority in the legislature.
EDIT: Just looked up and inflation was over 200% annualized when Milei took office.