This guy again.... he seems to make a pattern of these claims.
http://www.androidauthority.com/corning-responds-samsung-galaxy-note-7-scratch-test-video-711210/
http://pocketnow.com/2017/05/06/zagg-responds-to-jerryrigeverything-scratch-test
https://www.macrumors.com/2016/09/16/iphone-7-undergoes-extreme-durability-test-video/
There are others, he's made the same claim about the iPhone8. I remember that last video's claims being a big deal right after my iPhone 7 arrived.
I've seen numerous people (random people on the internet whose credentials I can't verify) say that he is using the Moh's hardness scale picks incorrectly (just see the first one). Basically saying the same thing that Corning said in response but I can't speak to the veracity of that.
What I can say is that my iPhone 7 camera and home button have never scratched, nor have any of the apple watches I've owned (3rd just arrived)...even though I often workout fairly heavy kettlebells and dumbells. They would have 6.5 hardness and brush against/swipe over/bounce off of the screen with regularity, so if his tests are correct I should be seeing lots of scratches from these. [And I'm not talking about lightweight 40lbs-ers here, either... so the scratches should be pretty noticeable.]
Also, if you look at his videos it seems that every manufacturer he reviews seems to be 'lying' about the hardness of their products. (or at least most of them). And he never shows the scratches in enough detail for us to determine if he is just rubbing of a coating, or if we are seeing the material from the picks rubbing off on the sapphire.
Seems fishy to me, either an industry-wide conspiracy which everyone is keeping quiet about or one guy using his tools incorrectly.