I already addressed the latter, but I know you have trouble reading, so I'll reiterate. You're talking about pictures of people speaking with their hands and happened to have them raised in the moment a photograph was taken. That's normal. I'm talking about a movement. Video. Motion. Done deliberately. Twice.
I don't know what his motivations were for doing a Nazi salute. Maybe he's a Nazi sympathizer. Maybe he did it for the lulz. Maybe some other reason. I don't know. I'm saying he did it, regardless of his reason, and he didn't deny it or repudiate Nazism.