The point is that, while Zen Coding is easy to manipulate (C), it's being converted to something hard to manipulate (Assembly) as you go, making it challenging to go back and rearrange things.
Seeing as the response is to a comment asking for differences, wouldn't it make sense to assume that it shows differences? In fact, the response notes that they are an example of a "crucial difference".
I don't think that there's that much of a difference - The site starts out the same colour as the header, in fact, and fades gradually. The majority of the piece, however, is on quite bright orange.
