Watching it over and over in slow motion. Both players are on the ground when contact is initiated. Palmer is clearly leaning into Coffey and Coffey is playing positional defense and had not yet arrested his motion towards Palmer. This is therefore, a foul. Correct defense would have moved Coffey a foot closer to the basket so he could elevate and block/obscure Palmer's view. A player who regularly goes for blocks would have played it this way.
Also, really bad positional defense for denying a player the ball on an inbounds pass. Maybe Kalesheur or McBrayer could have covered him better? Or anyone who hadn't played all 40 minutes of the game?