Is this really all that interesting? Isn't he probably just saying Explorer isn't the shell in W8? You've been able to set different shells for years haven't you?

Looking on the page regarding their choice of license you will find the following, rather charming, text.

"There's no virual [sic] effect as seen with the GPL here."

I'm not going rehash the whole the-GPL-is-clearly-not-viral explanation here but I won't be looking at this software because people who spout this kind of rubbish aren't the kind of people with which I like to be associated.