My observations are first a striker-fired gun. You may disagree, but I simply do not trust striker-fired guns, period. Maybe an explanation, maybe not.
Second, he states he doesn't know if he pulled the trigger or not! Bet he did. Hurrying to "beat the clock" as he stated can result in things like this! Drawing shouldn't cause an A.D. as any un-intentional/incidental contact, except by the trigger finger, should be forward on the trigger, not to the rear!
I will admit I have had one A.D. in my life that was a pure screw-up! Didn't keep my trigger finger clear of the trigger on a rapid draw with a DA revolver. Gun fired in the holster in a 4 o'clock position and struck the ground in front of my then wife who was sitting a few feet behind me! This was in 1966 Absolutely I Screwed-up, no question. My fault, pure stupidity! I will put money of the maker of the video doing the same thing! Ruined a perfectly good holster I had just made too!
On a draw use your middle-last fingers and thumb. KEEP your trigger finger straight until the gun is pointed down-range! A.Ds in an AIWB expose you to far greater danger than any other carry position. You need to be extra careful with them.