I took a Front Sight defensive handgun course recently, and they said during the course, do not put a malfunctioning firearm in the holster.
This type of carry (holstered, unloaded) is similar to a Type 1 malfunction since if you unholstered it and pointed at a target and pulled the trigger, nothing would happen.
So Attorney Cooper is correct. It is imprudent to carry an unloaded firearm. The prudent thing to do iswalk around with a loaded firearm in case you need to quickly draw and fire a controlled pair into a bad guy's chest area.
At seven yards or less (see Tueller drill), the bad guy can be on you faster than you can draw, aim and fire, never mind draw, pull a mag from a pouch, index it, insert into the magazine well, pull back the slide to chamber a round, aim and fire.
Maybe someone could point out his statement would seem to encourage loaded open carry, which is apparently against the law in San Diego, sad to say.