In the A320 series the MAX autobrake is not recommended for landing if you read the QRH. And it cannot be set in the air anyway.
Must be new modification. We used to operate 320 with serial no in low 200s which once landed with max autobrake armed. The crew swore it was genuine mistake and they absolutely were not bent on experimenting. They were surprised by rapid derotation immediately following touchdown, but otherwise rollout was normal and nose gear suffered no damage.