It's a good idea. just that the translation, though, not technically wrong, it's phrased weird. Imo it should look like this:

"ADVERTENCIA! La inflación está robando tus ahorros. Opta por no participar ahorrando en bitcoin. Dinero que no tiene inflación."

Also the QR takes me to an site that's written in english. So the person still needs to know English to interact.