He places very well, so its not much of a handicap. He also hits what he aims at, a slightly more important skill than reloading. Do you think fumbling for the small flat surface of the slide lock is easier or harder to do with a single digit as opposed to your entire hand grasping the slide??
Follow along. Your slide can be in one of two positions. Forward or "in battery", or locked to the rear at "slide lock". Will using the slide lock chamber a round from both of the positions mentioned?? No, it will only chamber a round from 1 of the 2 possible positions, making it effective only 50% of the time. Will racking the slide chamber a round with the slide in either of the two positions mentioned?? Yes, that makes racking the slide 100% effective, regardless of slide position. Racking the slide is also used to unload the pistol(administratively) and is key to an effective immediate action drill. Its also used for remedial action. The slide lock is used for one purpose, to lock the slide back indicating the pistol is empty. It does this during normal operation and you can do it manually for administrative purposes. Racking the slide is an important skill, and its universal for all autos, works for right and left handed shooters, strong and weak shooters, with or without gloves and can be done with one hand.
TDC