Except he wasn't going for extra yards. Just wanted to burn a few more seconds off the clock. Here's the Raiders head coach (I think still) after the game,
“We was gonna snap the ball and really just throw the ball out of bounds and just — the ball’s at the 32 yard line. We were gonna kill four or five more seconds and kick a 49-yard field goal."
Just very bad situational football. If AOC just waited 10 seconds to spike the ball it would ensure the kick was the last play of the game. However, he didn't. At that point since you don't have timeouts to clearly explain what you want your QB to do then you just send the field goal offense out with 15 seconds left on the clock. I mean it's highly unlikely that Mahomes can drive down the field with 6 or 7 seconds left. 13 maybe but not 6 or 7.