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How does this scam work?
Scamming old people has grown into a massive and well organized industry that brings in billions in profits per year. It is a huge problem that has continued to get worse. As others have said, this is 100% a scam. They will inevitably use any number of techniques to extract money from him. It is very possible they already have and he just hasn't told you yet, it is not uncommon for the victims to be secretive about what the scammers are getting them to do.