All policies described in this document apply only to non-premium, tournament-legal Magic cards. Wizards of the Coast has and may continue to print special versions of cards not meant for regular game play, such as oversized cards.
A little vauge. It can be interpreted to mean that WOTC doesn't think people will play with their DCI Foil cards in tournaments. Maybe I'll get a response from WOTC. But, I'm guessing it will be simply WOTC quoting the above paragraph.
"Non-premium" is what matters there.