IMO he's right about trigger reset, when I'm shooting rapidly I don't ever notice the trigger resetting. Part of the is probably due to my spending about 2/3 of my time shooting revolvers, you learn pretty quickly with a wheelgun that it's best to bounce your finger off the trigger during recoil. I do the same thing with my semi's and I have yet to short stroke the trigger. Back when I could afford to shoot twice a week I was edging my split times down to 2/10 second, now that I can't afford to burn this much ammo I'm running between 4 and 5/10 splits. While that aint great, it'll do for Defense as long as you're scoring hits with each shot.
He's also correct about the aiming process. Years ago I recieved a bit of training from a Police Instructor and he gave me the best advice I've ever recieved. That is to NOT watch the sights, watch your target point and as soon as the sights come into a line between your eye and that target point, pull the trigger. In just 15 minutes I cut my split times by 40%, since then I've shaved it even more.
PS; my idol is Jerry Miculek. Eight rounds per second on a playing card at 5 yards with a revolver, now that's shooting.