Sam Vankin claims he is a malignant narcissist not a psycopath. He is even adamant about it. He seems very knowledgeble about the subject and found myself listening to quite a few of his rants. I also saw the documentary you mentioned and am on the fence.
Yes, I know he does. In the documentary he is assessed by some very knowledgeable experts and he qualifies as a psychopath. There's also comorbidity between NPD and APD and some traits also overlap.