It is oft' said that there is nothing more certain than death and taxes.I cannot see how someone with good foreign income can willingly subject himself to Argentinian taxation. Tourists stamps for as long as possible then settle nearby where foreign income is not taxed.
Of course you have to be alive to be able to pay taxes.
Based on what I've learned in the past ten pus years, I think it's fair to say that anyone with a desire to live on a finca will be more likley to be able to pay taxes in the future in Argentina than South Africa.
That being said, someone with a "good" foreign income may not have to pay any income tax in Argentina, but it all depends on how one defines the word "good."
It took less than two minutes to see (on the AFIP website) that the current threshold for taxation of monthly income for residents and citizens of Argentina is $150.000 pesos.
At today's Western Union exchange rate for USD, that's about $850.
That means a couple (acting as individuals using separate accounts in each counrty) could transfer the equivalent of almost $1700 USD per month without having to pay income tax in Argrentina.
I have been living on a quinta of 2.5 acres for the past eleven years, and, with a monthy income of less than $850. I have been easily able to pay all of my bills, including insurance (house and car),utilities, and property taxes, buy all the food and suplies I need, as well as maintain my house and vehicle...and still have enough $ to buy furniture, housewares and decorative items (vintage and/antique) for my home, and, whenever it is necessary, replace many other items (water pumps, generators, TV's, DVD players, smart TV boxes, lawn mowers, garden tool, hoses, etc).
I do not pay the bienes personales (asset tax) on my property in Argentina because (last time I checked) it's valuation by ARBA is about twelve million pesos below the minimum amout subject to the tax. I don't pay it on foreign asssets in my "home" (or any other) country because I don't have any.
I can't be sure, but I imagine Newman and his wife will liquidate any assets they have in South Africa prior to their departure, especially if, like me, they have no desire (or, even more likely in their case, little hope of ever being able) to return.