I would argue that outsourcing failed primarily due to companies trying to farm out the coding to uninterested entities whose incentives did not align well. Not necessarily because the foreign workers doing the coding were bad.
Back to the guy in Argentina -- I imagine that he/she is actually in a reasonably good position as the amount of remote work increases. Indians not so much, because they are 12.5 hours ahead (of Pacific time). Argentina is only 4 hours ahead, which makes for a lot more overlap.
So I think the field has leveled a little bit in that sense, because if you have a remote developer in another state, they are not very different than one in another country who happens to be in a similar time zone. The other big barrier IMO is communication, so someone in Argentina who is not merely fluent in English but speaks it very clearly could be in a really strong position.