I think he's talking about the mag release, not the slide release. You are, of course, correct that loading from slide-lock is materially and reliably faster when done using the slide release lever rather than any direct manipulation of the slide.
yes, the mag release. i can reach it with no problem on the glock 17, but not on the czPerhaps that was his intent, but I thought otherwise. Why? Because I've never had problems of reaching or pressing a mag release, but I have had a lot of problems reaching and releasing the slide stop/release, without changing my grip.
For a number of years, the only gun I owned that let me easily release the slide without changing my grip was a Glock 34 (which had an extended release.) I later learned to use my OFF-HAND to release the slide.
yeah, i still have to do this as well, i was hoping the rubber grips would be of help, but they are not, except for a whole lot more comfort!Even with my thinner VZ grips, I have to shift my grip a bit to use my thumb. A longer mag release will fix that, and I had one on a different gun, but sold it years ago.
https://czcustom.com/cz-parts-all/mag-releases-brakes/cz-factory-magrelease-85-combat.html