No, but Apple has more to lose if they were caught lying, and they don’t have to.
http://www.iphonehacks.com/2016/10/iphone-7-camera-sapphire-lens.html
And even in the video, JerryRigEverything notes that when tested, the camera lens cover reads back with a “huge reading of aluminum oxide,” and notes that, with the test, it confirms the camera lens cover is made from sapphire:
“When I tested the outside of the lens, I got a huge reading of aluminum oxide [sapphire — Ed.], which means the lens is most definitely sapphire on the exterior.”
As the report notes, the sapphire camera lens cover is not scratching, like the watch is in the video, but is instead fracturing. The video even notes the differences, which is an important distinction:
“Fracturing — as opposed to scratching — is what happens when you have something so incredibly thin — unlike the much thicker watch used for comparison — and you apply pressure with no level of control.”
There is silicon glass on the camera lens cover, but as noted in the original video, this is probably for something else entirely than protecting the camera itself, including to “minimize reflection or something minor.” The camera lens cover also includes other coated materials, including one to minimize fingerprints, but the camera lens cover is sapphire.
JerryRigEverything even noted in a followup tweet that the camera lens cover is “solid sapphire,” and that it is not a laminate or glass:
https://twitter.com/ZacksJerryRig/status/783331109962600449?s=20