I don't know what Elon's intentions are and wouldn't begin to guess. There is a huge difference, though, in being able to say factually that someone was murdered or that the legal system of apartheid ended and saying why you believe someone made a certain gesture.
Anyone could raise their arm and accidentally make a motion similar to a Nazi salute, hell I wouldn't be surprised if you could find a few videos of John McCain making a similar gesture due to his shoulder injuries. Making that gesture doesn't make you a Nazi or it a Nazi salute, why you make that gesture is what decides that.