As we have mentioned before, we here at Mull to Four don't actually read the cards, we assumed that since most of the player base is Yugioh players, that we get to make up what our cards do.
On a serious note, you're actually correct. When I was writing the article, I thought that Itachi said ' 0: Discard a Ninja. Then, draw 2 cards.' in which case, he would be able to discard himself, as the drawing of the 2 cards didn't have a mandatory link to the discard of the Ninja.
Nice catch, I'll edit it. Prior to this, MJM was under the same assumption, because I'm a cheater and wanted to draw 9 cards in a single turn.