Some are saying the video is symbolising Glover being kind of a loner in a crazy hip hop music scene, observing everything going on whilst drifting through marching to his own beat which I guess he's known for.
OTHERS are saying this is his "Goodbye" to his music career, as he's said he's quitting "the rap game" soon. Looks like he's taking one last look at his contemporaries before "going home".