There is a lot of misinformation, exaggeration, fear-mongering and myths floating around about the supposed "danger" of Millei.
The basic fact of the matter is that whatever his opinions may be (and anti-gay is not one of them...), he and others from his party have repeatedly affirmed that they will govern according to the constitution and respect and work to strengthen a fully independent judiciary. That combined with the fact he will need support from other more moderate political factions just to govern, means that there will continue to be all the checks and balances of a fully functioning democracy, regardless of whether some people like his opinions or proposed policies or not.
The economists cited in the article are warning: “However, while apparently, simple solutions may be appealing, they are likely to cause more devastation in the real world in the short run, while severely reducing policy space in the long run,” should remember many of these simple solutions such as eliminating the central bank or actual dollarization simply will not be possible in the short term due to the above-mentioned reality.
As for the economy, the fact that the current minister of economy Sergio Massa has already announced that his minister of economy (if elected president) will not come from his own political party already points towards a deepening economic disaster that he is proactively distancing himself from which is not exactly encouraging in a context of 140% inflation and 40%+ poverty, which has only worsened under his command to date. Turning around an oil tanker takes time and there are choppy seas ahead.