The real question is not the dollar to peso number, but the inflation to exchange rate ratio.
If every single price in Argentina followed the dollar rate exactly, then, yes, this would be a terrible thing.
But it doesnt.
Some things track pretty directly and quickly- say, the price of a new Iphone.
Other things lag by months, sometimes even years.
The amount the Blue rate affects the cost of living in Argentina is the real issue- and its complex, non-intuitive, and inexplicable how some things go up a proportionate amount, while other prices go up at varying relationships to the dollar, and at seemingly random times.