You are probably correct in your explanation of what they mean, except... how many people who read that blog are going to understand the context?
Vocabulary is everything, and words mean things. I believe that most common people would understand the verb "use" in the context of immediately firing the gun, not carrying it over an extended period of time in the anticipation that you may need to fire it at some unidentified point in the future.
For that meaning of the word "use", the rule is simply wrong.
I really wish someone would come up with a set of rules that made sense at all times and under all circumstances.
I think I like the
Candian Firearms Program rules the best. From Wiki:
The Canadian Firearms Program uses the concept of The Four Firearm ACTS:
1. Assume every firearm is loaded.
2. Control the muzzle direction at all times.
3. Trigger finger off trigger and out of trigger guard.
4. See that the firearm is unloaded. PROVE it safe.
—Canadian Firearms Centre, The Four ACTS of Firearm Safety[
3]
TFred
ETA: I like these rules #1 and #2 especially, because they allow you to live in "real life" while keeping the rules. Some of the other rules do not (for example the rule I hate the most is "All guns are always loaded.")
If you "assume" every firearm is loaded, that means you always check each time you handle the firearm. It allows you to do that check, then proceed to clean or perform maintenance, which are activities that one simply would not do if the firearm were actually loaded.
"Controlling" the muzzle is also good because yet again, it allows for real life. It prevents careless handling, sweeping, etc, but also allows me to shine a flashlight through the barrel after I've cleaned it to see that it is clean. Some of the other rules, such as "Never let the muzzle cover anything you are not willing to destroy" would not allow you to properly inspect a gun.
The worst rule is a rule with "exceptions", especially exceptions that are not documented. A rule that does not always apply and that must occasionally be broken is a dangerous rule.