Hindawi journals seems to be a frequent target of unscrupulous players- parent company Wiley is working to identify and correct weakness that likely contributed to exploitation of the journals. See also paper mills section of the 'Predatory' (Deceptive Publishing) page in this research guide.
There is absolutely no suggestion of fraud or deception associated with Dr Wolf's research. The 'death recorded' error appears to be an innocent error, based on misinterpretation of a legal term.