Perhaps I'm reading something wrong but 6 years is only about 52,596 hours. 2 Million hours is more than 288 years so I doubt they've actually tested it for that.

The 6 years number for write endurance is almost believable (I'd like to see the actual tests, though) but the 2 million hours sounds more like an expected non-operatioal shelf life than anything else. Is this nothing more than smoke'n'mirrors advertising with big unprovable numbers to impress and entice the unwary user?