That's besides the point. Corning's glass was non-existent in the market until Apple introduced it. Apple didn't feel the need to advertise their deal with Corning whereas everyone else did, trying to take credit for the work Apple did by advertising they were using top of the line glass. That's shameless.
So your claim is that other manufacturers saying they bought Gorilla Glass is them trying to claim credit for Apples work but Apple refusing to say who made the glass used by the iPhone is not Apple trying to claim credit for Cornings work.