You have stumbled onto a topic that has been discussed many times here before ... which is ... what should a CHL holder do about a business that has not posted 30.06 compliant signage but has made it clear they do not want CHL carrying on the premise (usually by posting non-compliant signs)?
Many here think you should vote with your wallet but not make any 'noise' because others will still want to shop there and they are worried about the owners getting 'wise'. While some (myself included) think you can still practice consumer activism but avoid referring to the PC code altogether.
My summary below:
Not ok to discuss whether a sign is legit or not ... don't want to teach them anything they don't already know ...
Is ok to let them know they won't get your business because they don't allow guns ... don't want to crush good old time tested consumer activism ...