FX rate is set by "the market".
"overvalued" is an opinion, and while I agree its ridiculous, obviously the people (and computers) who daily trade FX in the Trillions of dollars (over 7 trillion a day) set the price. Probably only a few billions in Argentine pesos, depending on the day, but still.
Nobody can change the FX price by arguing.
The Milei regime has failed completely to open international trade, currency trading, FX, or banking. Mainly, in my opinion, because the big boys who actually run the country, and control the congress, wont let Milei do much.
The global traders who are willing to buy and sell Argentine pesos have set this rate, daily, based on how much hassle, profit, and liquidity is involved, and based on future expectations, which, also obviously, are pretty low.
No amount of press conferences will change the argentine mindset, that keeping any assets they currently have, either in paper dollars, offshore accounts, or real estate, is safer than hoping Milei will miracuously save the economy this year, or next...