If you admit that caution is paramount then, how do you suggest the potential buyer use caution?
One should NEVER attempt to buy too close to the border with Chile. Perhaps, this changes a bit in Rio Negro. I am not sure. But, I have heard of lots of foreigners who did buy in Rio Negro and lost whatever money they had put into the purchase.
I would suggest that anyone who wants to buy only put a very small downpayment until they receive the title. Then, pay the rest.
Foreigners/tourism are big business Argentina. They are all moving targets whether they realize it or not.