Even if they open up to the world, the amount of tourists will be minimal at best - long haul tourism is practically dead globally at the moment. People generally only feel comfortable traveling closer to home. This is evident in long haul pax numbers globally. For example, most Europeans would need to worry about being quarantined upon return and this potentially would eat into their holiday leave from work. Then there is finding travel insurance policies that would cover them when Argentina features in government travel advisories for COVID as “all but essential travel” or similar. Not to mention the fear of getting sick in a strange land and being grounded for a few weeks in a hospital or potentially expensive hotel quarantine ruining ones plans.
It’s a stupid policy, there will always be a few who want / need to travel anywhere and excluding them won’t achieve anything. But thinking it will do much to create an economic boost ... not convinced either. As stated earlier, you need to be a bit foolish (or otherwise invested) to come here at a time like this, especially if it involves traveling half way around the world.