the experience of a state that is far too effective at fucking up the economy is why the argentines elected a total nutbag as president on the strength of his campaign promises to vastly reduce the effectiveness of the state
A large government spending lots of money. Add in wage and price controls (classic authoritarian leftwing policies), and economic ruin was an inevitability
Inflation has nothing to do with libertarianism and everything to do with a state that tried to run everything and inevitably failed.
But fundamentally (if you look at the twenty tenets of Peronism) it is a populist leftwing ideology that aligns strongly with trade unions, social justice and economic nationalism. We can argue the toss as to whether this implies it is "socialist" or not, but it's certainly far from free market capitalism.
what you said was, 'Actually the Government has been socialist in Argentina from WW2 to 1970, and then from 1989 onwards', when in fact the numerous socialist parties in argentina have held the presidency or a majority in congress for a sum total of exactly zero days during that time
clearly what you're referring to there is peronism, not socialism, and you're also unaware of the administrations of frondizi and the various military dictatorships before 01970