Two years ago, El Salvador shrugged off a chorus of warnings and adopted Bitcoin as legal tender in a bid to revitalize its economy and improve access to financial services.Economist Cesar Villalona told AFP that Bitcoin "does not exist in the local economy" in any significant way, because in El Salvador "everything" is paid in dollars: wages, services and goods.
The story and OP’s blurb both say that all the locals use USD for everything, not the El Salvador Colon. So you comparing the volatility of the ESC to BTC is worthless.