Did you somehow miss this on that page??
"Due to customer agreements, we cannot identify all devices that feature Gorilla Glass. Your favorite device may include Gorilla Glass, even if you don't see it listed. Ask your manufacturer or retailer to learn more. "
So what....did you call corning and they said "Yeah, we supply Apple"?
There is ZERO evidence that GG is being used. There is only ONE reference for GG and that was for the iPhone 1.
Otherwise....there has NEVER been any published or confirmed use of GG in iPhone/iPad.
----------
Read Steve Jobs bio. Steve Jobs himself was the first to go to Corning and asked them to develop glass for a phone before any Android devices even existed. He pioneered the use of gorilla glass in portable devices. Before that, virtually all phones used plastic screens. ALL iOS devices use gorilla glass.
FOR THE IPHONE 1....that's it. You're assuming that GG is still being used.