It does affect whether it chips or not, like the older MacBook Pros or PowerBooks.
I think he meant that stamped or milled aluminum are the same when it comes to anodizing..
And, yes there is no paint added during anodizing process for Apple's laptops. What you see is the natural aluminum color. It is, however, sand blasted before anodized, to create that matte texture feel.
Another thing is, Apple went for the cheaper form of anodizing. A real hard coat of anodizing is so hard (and scratch resistant) that it is second only to diamond!
So tempted to recoat my laptop...