One must be possessed just to go into politics, much less to succeed in it. The idea that possesses Javier Milei is Economics 101, which is not a bad place to start when overhauling the government. A liberal, or libertarian, believes that carefully designed markets beat government intervention every time. An anarcho-libertarian, or anarcho-capitalist, believes that carefully designed markets are capable of emerging spontaneously whenever in demand. A neoliberal believes that the government failure is always graver than the market failure; even if a perfect market fails to emerge spontaneously, government intervention can only make matters worse. Milei is somewhere between neoliberal and anarcho-libertarian---in the realm of Econ 101, in other words.
One can admire the modern government as a miracle of self-organised complexity akin to a world city such as London or New York or fear it as one would runaway artificial general intelligence of science fiction and now the near future. One certainly cannot deny the runaway aspect of modern governments, even the most successful of them. The anarcho-capitalist scalpel applied to the tortured body of Argentinian politics by a steady hand of an Econ 101 enthusiast may prove to be the very salubrious intervention that the country needs.
Milei has read multiple books, some of them with equations. This is a commendable quality for a politician to possess.