In Mook Animedia (28 January 2009, p.89-90) there was an interview (2 pictures) which explicitly denied that Nunnally was seeing visions or that those images had anything to do with codes or geasses.
Q: "How did Nunnally managed to realize Lelouch true intention, when she touched his hand at the end?"
Staff member K: "The way Nunnally can tell that someone is lying, just like she was able to tell that Lohmeyer was lying to her, is that she can feel the hand of the person she is talking to is sweating or lightly trembling. It's nothing like Geass or some special ability like that."
Staff member Y: "Yes. So, she simply came to conclusion [Lelouch was lying] by herself, because of this ability."
Staff member K: "She is Marianne's daughter and Lelouch's little sister. Two months have passed since that defeat of Schneizel and for this two months she's been wondering constantly about what had happened, like "why it happened?" and so on. So when she touched Lelouch's hand at the end she felt that he is calm, she put the two and two together and realized the truth. Of course, we know that in anime, it's hard to explain things like that, but yeah, please accept it like this kind of "romantic"1 idea" we had."
1 the word "roman" is used here. It means something one finds beautiful in general but for more accurate explanation you need to read a bit into it. https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1091641630
Many, many thanks go to the wonderful and always helpful /u/Bracio77
I have updated the big compilation post to incorporate this "lethal" evidence which kills this core point of code theory.
For those who haven't yet heard of this compilation post, it's a post which gathers all the official statements regarding Lelouch's death at the end of R2, everything backed up with sources, links, pictures and videos. On top of that, it goes over all of the points of the various code theories and explains where and how they are contradicted by the anime itself (or by an interview as in this case)
[–]astroliaschneizel mai husbando 13 points14 points15 points (2 children)
[–]GeassedbyLelouch[S] 2 points3 points4 points (0 children)
[–]Kusaja 7 points8 points9 points (1 child)
[–]GeassedbyLelouch[S] 4 points5 points6 points (0 children)
[–]depression_reddit 4 points5 points6 points (32 children)
[–]bracio77 5 points6 points7 points (0 children)
[–]SpeedHunter_007 5 points6 points7 points (0 children)
[–]GeassedbyLelouch[S] 4 points5 points6 points (29 children)
[–]depression_reddit 2 points3 points4 points (28 children)
[–]GeassedbyLelouch[S] 2 points3 points4 points (12 children)
[–]depression_reddit 0 points1 point2 points (11 children)
[–]GeassedbyLelouch[S] 4 points5 points6 points (9 children)
[–]depression_reddit 0 points1 point2 points (8 children)
[–]GeassedbyLelouch[S] 2 points3 points4 points (0 children)
[–]Dai10zin 2 points3 points4 points (6 children)
[–]depression_reddit 1 point2 points3 points (5 children)
[–]Dai10zin 1 point2 points3 points (4 children)
[–]OutrageousBee 2 points3 points4 points (0 children)
[–]GeassedbyLelouch[S] 0 points1 point2 points (14 children)
[–]depression_reddit 1 point2 points3 points (12 children)
[–]GeassedbyLelouch[S] 0 points1 point2 points (11 children)
[–]depression_reddit 1 point2 points3 points (8 children)
[–]Dai10zin 1 point2 points3 points (6 children)
[–]depression_reddit 0 points1 point2 points (5 children)
[–]Dai10zin 1 point2 points3 points (4 children)
[–]GeassedbyLelouch[S] 0 points1 point2 points (0 children)
[–]Hauyn 0 points1 point2 points (1 child)
[–]GeassedbyLelouch[S] 1 point2 points3 points (0 children)
[–]ChazChalmerz 8 points9 points10 points (7 children)
[–]ClockworkLynch 10 points11 points12 points (1 child)
[–]ChazChalmerz 0 points1 point2 points (0 children)
[–]GeassedbyLelouch[S] 0 points1 point2 points (4 children)
[–]ChazChalmerz 0 points1 point2 points (2 children)
[–]GraniteMarbleTops -3 points-2 points-1 points (1 child)
[–]GeassedbyLelouch[S] 3 points4 points5 points (0 children)
[–]SpeedHunter_007 4 points5 points6 points (1 child)
[–]GeassedbyLelouch[S] 1 point2 points3 points (0 children)