Could simply be he got the part and assumed because it's so tough that it's sapphire.. meaning it's a legit part, but he's clueless about what it actually is made off.. Could be next gen Gorilla Glass. lol
That said, it did hold up better than the iPhone 5s screen.. soooo it could be a sapphire laminate / composite..
That said, this also could add credence to the rumor that only the 5.5" will have Sapphire as a premium feature..
We won't know until September for sure...