A German weblog has a photo of a box of soap made from Mangalitsa fat. The guy behind it - Wolfgang Pucher - is well known in Austrian circles.
I believe that the lardo you see here (some of the best) came from one of Pucher's animals.
He's done things that normally you'd only read about. E.g. hanging Mangalitsa hams in caves. It doesn't surprise me at all that he'd produce some awesome soap from his pigs.