Not just that, but if you could have zoomed in a little then would have found a cute little "This copy of windows is not genuine" in the bottom right corner too
Don't worry about it, Because these systems are air gaped and even you provide license the key management server or validator can't talk with ms servers, also these win7 not a stock win 7 we used in past, these are hardned customized ones , most of the embedded win os are not similar to regular win7 os they where Custmzied to kernel level which will remove non used default components and remove any telemetry function to ms or any their party servers, for example the most notorious virus wanna cry infection happen around the world because of O'Day in smb protocol used by CIA( later leaked by shadow brokers) but t even these kind of vulnerability won't affect the military garde older windows operating system because by these vulnerable services are removed and os is completely Custmzied, the reason we use xp or win7 is legacy driver support I think some of the UAV communication device or telemetry components uses legacy protocols these protocols may be developed in early 2000 so these device drivers won't be able to function in modern version windows OS like win 10 or above,
Ps: yes the most terrifying part is Chinese CCTV, the systems are air gaped but not cctv systems, they can subjected to remote intrusion or espinoge activities