Clearly people have no idea the level the nba athletes are. Those videos mean absolutely NOTHING with regard to murrays athleticism. And I mean nothing. In fact, I would bet you that Steve Kerr in his heyday could make roughly the same video. Or better yet, go google sullingers high school videos. After watching those, people probably would think he was the second coming of Charles Barkley.
And no, sully hasn't gotten less athletic.