I don’t know what this is, but it is not Diet Coke. Don’t think it’s even Diet Pepsi.
I believe this here is “cola” being pawned off on unsuspecting restaurant customers as “Diet Coke.”
Sir, I know Diet Coke, and you are no Diet Coke.
(Speaking of Unidentified Foreign Objects, I believe the genre of music being played here would be categorized as “Bollywood Rap”. Which wouldn’t be half as bad if the station wasn’t half static.)