I’ve seen it used as a variation of the “Circle Game” https://www.dictionary.com/e/slang/circle-game/
WHAT IS THE CIRCLE GAME?
The Circle Game is an activity in which one person makes a “circle” with their fingers closely resembling the “OK” hand gesture and holds it below their waist, convincing a second person to look at it. If the second person looks, they receive a punch to the shoulder.
Pictures of people making the circle with their hand, particularly as a way to photobomb an otherwise serious photograph, are often accompanied by the phrase got ’em or simply gotem, meaning that the circling hand has “got” whoever is looking at it.
While the Circle Game mostly avoided the “OK” sign controversy, it did briefly get roped into it following one particular incident. In December of 2019, military cadets were caught flashing hand gestures resembling the “OK” sign on ESPN Gameday during the annually televised Army–Navy college football game. The U.S. Military Academy reviewed the incident and concluded that the cadets were playing the Circle Game rather than endorsing any ideological views.
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I am sure that the cops in that photo were doing the hand gesture harmlessly. People read into stuff too much sometimes.