fired for this, but I think more saliently kept on until this, despite every indication that he was not someone who should be a cop.
That's my takeaway as well.
I see two officers in the video. One who we does the handcuffing and one who's body-worn camera we see the incident through. I'm blocked from the article you posted, but through an other link [1] it seems only the one with the camera got fired.