Yes, Moore stopped his route, but I got the feeling that Mahomes was expecting Moore to look towards that outside, away from the defender and throw it there, while Moore slowed down and looked to the inside. In the news conference, Mahomes said he should have thrown it back shoulder more, but I got the feeling he was covering for Moore.
All season long Mahomes is throwing to the spot to protect the receiver, and for some reason, they either stop or slow down their route, or look back into the middle of the field, instead of where Mahomes is throwing to keep them from taking a hit.