I'm not sure i agree with this. Personally, I figure concealed is concealed any place except one prohibited by law. But that's my PERSONAL opinion, NOT a legal one.
Again, my personal opinion is that it would be difficult to find an Oklahoma jury to convict you if you were carrying a pistol in a store with a gun buster sign and found yourself having to stop a deranged gunman or knife man or axe man or whatever he was wielding.
I took this legal advice with a grain of salt. Just like anything else that relies on the courts for resolution, it all comes down to what's likely vs what's possible. Is it likely that I'd be prosecuted for nothing more that carrying past a sign? I don't think so. Is it possible? It's an interesting theory, but of course anything is POSSIBLE in the realm of legal theory.