It says that you can not carry if you have alcohol in your system.
Let's say that I go to a friends house for a beer. Can I lock my firearm up in my jeep in the cargo area and still drive legally (not intoxicated).
If your firearm is locked up, and the ammunition is separate from the firearm, you are no longer carrying concealed. Instead, you are transporting a firearm according to allowed state and federal law.
I happen to always have a small transport safe in my car at all times for cases when I am forced to go into a place of business that doesn't allow self-defense tools. If at some time I would happen to have some alcohol at a time I didn't expect (unlikely, but possible), I can
also use that safe to secure my firearm once I have unloaded it (and separated the ammunition from the gun by putting it in a bag in the back of the car, NOT in the safe)---and suddenly, I'm not carrying concealed but instead merely transporting an unloaded firearm.
Different rules.