the article isn't exaggerating; I take out two hundred kronor (not from an atm, but from the cashier at a supermarket when I pay for my groceries) and then it sits in my wallet 'just in case' for months. I carry a 10 Kr coin too, in case I need to use an old public toilet or borrow a shopping trolley.
Swish is really taking off too. Even market stalls take Swish.
The part of the story that shows its Americanism though is the intro - churches in Sweden are basically empty :)