I've been looking around some hockey forums trying to gauge how others feel about this, because in my friend group/family basically nobody else follows hockey. I'm surprised at the amount of folks who are getting really bent out of shape when someone comes along and suggests that it at least looks intentional. They seem very against the notion that he might have done this on purpose, even though the video looks awful.
I mean, I definitely don't think he intended to kill the guy, but I'm not convinced that he did not intend to throw his leg out to hit him lower, like in the torso or knees, and somehow caught him in the neck.