I do NOT think there was any real choice there.

Back in the real world, the Central Bank of Argentina had a huge amount of negative reserves. If you think the US or EU are essentially bankrupt, Argentina is at another level.

Nobody lends money to serial defaulters.

Milei wants to achieve the almost impossible, deactivate the Central Bank ticking bomb without defaulting in the process, trying to minimize the pain for the population in the transition. So far he is managing it, inflation trend has reversed and capital controls might be close to be removed. Next big milestone after that I believe is closing the Central Bank for good, so next politician in power cannot print the population into oblivion.

If that ends up working, Argentina might be able to fund the government through normal markets again, pay the IMF loans and be done with them.

Milei so called "dollarization" is really not such, instead the law allows to chose currency. Argentinians prefer dollars today, and compared to Pesos, who can blame them?

But once they get used to measure inflation in yearly terms, instead of monthly, they will see the dollar is probably not the last currency they want to hodl. Bitcoin is inevitable and may have a better law environment there than in most other countries.