do you have a date stamp on that photo?
It appears Ron Brooks kneeling was during the 2017 NFL preseason.
How TV networks will handle NFL national anthem protests this season
http://www.chicagotribune.com/sports/football/ct-how-tv-will-handle-nfl-national-anthem-protests-20170831-story.html
Ron Brooks kneels during national anthem before Eagles-Bills game
https://www.bleedinggreennation.com/2017/8/17/16165514/ron-brooks-kneels-national-anthem-eagles-bills-game-philadelphia-video-protest-watch-kaepernick-nfl