No offense, but you sound like a democrat complaining about voter ID laws. Apples and oranges, maybe, but the complaint sounds the same. "Disenfranchisement!"
I disagree with the article and think the author is lying when he said that conventions and caucuses are not undemocratic. I think that making it purposely more difficult for rank and file republican voters to actually vote is inherently not democratic. I do not see where I am wrong.