I'm still not clear on what SGMD's point is, or why it's significant.
Generally speaking, some people appear to believe that iphone front/rear glass wouldn't break if Apple used Corning's branded aluminosilicate glass (Gorilla Glass). Since it can break, then the belief is that Apple isn't using Gorilla glass. This then forms the basis for arguments that iphones are inferior to certain android counterparts.
This hinges the assumption that Gorilla glass wouldn't break if used on an iphone. Since Gorilla glass can and does break on other phones, I'm not sure this assumption holds true.