Yes, and that was a pretty good reason to change it. So given what that salute is associated with today, I think it gives a fair indication of what kind of people those are. Or they could just be ignorant (but I repeat myself). I first heard his name and 'alt-right' at about the same time (or not very far apart anyway). I think the same is true for most people that have heard of alt-right, hence the negative view of those calling themselves alt-right.

While I could be wrong, I doubt they made up that salute on the spot or are doing it to harken back to 1915 nostalgia.