I'd bet that is just a 'warning' sticker to CTA. (cover their...)
While there is a manual shut off lever at the quick-connect, (silver lever in your photo) I've never seen anything hooked to the awning that makes the quick-connect non-functional if the awning is out.
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Are you sure you are just not getting flow, ala using a regulated grill on the regulated qd? Does flow restore when awning is in? Seems strange... But they do put in devices to keep the back TV from working when in gear.. So who knows!
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Ya, it will just be a valve in the pipe. If you remove it make sure you check for gas leaks. Should do that every year anyway do to the vibration when traveling.