If you already know their wishes I don't think you need to wait for any other form of notification. I'm convinced Whataburger management doesn't want me in their store unless I conceal my weapon. I've been in Whataburger enough while armed to the concealed teeth, if a modest little 9 so qualifies, to have a pretty good idea that's a non-event.Until they show me an employee who either is the owner or speaks with the APPARENT authority of the owner who verbally notifies me to leave, or shows me a written document with the identical 30.07 language written on it, or displays a properly posted compliant 30.07 sign I will have until then not been lawfully notified. And neither will anyone else.
To enter Whataburger, I double-check my concealment. It's their turf.
For the record, if you enter my place of business while openly carrying a pistol, if I have time I'll probably ask how you like it, and if it has a good trigger. A safely carried firearm is not alarming. I guess I don't see the difference between the street and a gun range. An armed stranger, absent reason to think otherwise, is just like anybody else. A friend I haven't met yet, with the added interest of packing a conversation-starter.
I'll also admit to a certain level of hypocrisy. I'm more frustrated by 30.06 than I think I will be by 30.07. My lawfully concealed handgun is a foundation garment. I wouldn't kick an MDA member out of my business for wearing a thong, even if it became accidentally visible.
Never would I kick an MDA member out of my business for wearing a concealed thong. They should be kicked out because they are a threat to society. The thong, that's a personal choice. Boxer or briefs, Glock or 1911, just not my business.