That's his writing style, but I don't know why. I guess pushing out papers all the time deemphasizes the style in which he makes his argument, in favor of inventing the argument.
No, but does it hurt? It emphasizes the main focus of the problem
Well since it's so obviously redundant you start to wonder that maybe it isn't redundant and maybe you're wrong and not getting something when in-fact you're right and it is redundant. To me it more annoying than emphasizing.
When you want to emphasize you should make it clear that you're emphasizing.