He looks slow to me and mechanical.
On the so called athletic ability, while those dunks may look great to guys who could not dunk or can't dunk. They are not that good of dunks. Some of them he is barely getting them over the rim and he is only jumping about 8 feet out with a step. if a guy can do that without a step off two feet then that is athletic folks.
I read that he has a 40 inch vert. But that is hard to believe given on some of these dunks.