They're not the typical sov cit. I'm guessing this person is just trying to get away with not paying for tabs. That license plate is a knock-off of a legit Kansas license plate, not the typical sov cit nonsense plate advertising their insanity.
Years ago I had a thin blue line flag on the back of my car. I didn't really care about the police, I just figured I'd be less likely to get pulled over.
Boy was I right, I drove like an asshole, sped everywhere and never got pulled over.