I did autopark 3 or 4 times since I got the MX and worked every time. It is scary but it works. OP, did you start video late? Because your starting position is already prep'ed for the back in. When I did it, I drive perpendicularly to the parking spot and passed it until the P shows up. Then put in reverse and hit the auto park button. When I did that, it is always a 2 turns process. The first back up and turn would never have enough room for it to not hit the car further back, so it has to stop, go forward to straighten out, then back again into the space completely.
In OP's video, it looks like the car was already prep for a 1 turn back in when autopark started. Maybe the software didn't like that.