I think push come to shove if you have a USD account there they will take them but if it was marked on they sometimes would refuse it. I think this article is referring to the amnesty and locals declaring cash. I have many local friends that had older bills but every time they go to the USA they swap them out. I had a friend that stockpiled older $100 bills but he would take an annual trip to Las Vegas and buy poker chips in the casino and then cash out that way for new bills.