When the chapter came out with the sentence I thought the same as everyone else, but since 469 was after this, the two sort of cancel one another out. If 469 proved that Sakura hadn't been in love with Naruto at that point, then the chapters before this basically meant the same. I'm not saying it wasn't a ship teasing moment, but later down the line Kishimoto made his official thoughts clear on the matter.
I'm not going to come to conclusions about Sakura's confession, but here's a few things you should note before coming to your own conclusions.
a.) It is more than possible for a girl to have feelings for more than one guy. Sure, she's a fictional girl, but she's also at the center of the romantic subplot, and she's also been stated, by Kishimoto, to be his intended 'realistic' girl. The last couple points you made seem centered around the idea that Sakura can only have feelings for one guy at a time, and loving Sasuke instantly disqualifies any previous evidence in canon that she had developed feelings for Naruto. Obviously not true.
b.) It was never stated in canon that Sakura was lying to Naruto. During Sai's speech in 474, he pointed out how Sakura was in love with Sasuke, but his only words regarding her previous actions were that she was thinking of Naruto, and that she wasn't telling the truth. Lack of truth doesn't necessarily equate to falsehood.
And even Naruto's words to Sakura, "I hate people who lie to themselves!" was curiously vague. It wasn't "I hate people who lie!" or "You are lying to me, Sakura-chan!" Instead Naruto spoke with a general phase, as in 'anyone who lies to themselves'. He also spoke about her own passive feelings, not what she actively telling him ('lying to yourself', not 'lying to me'). It seems more than likely to me that the 'lying' that Naruto was pointing was concerning her feelings for Sasuke, and not necessarily her confession to him.
c.) You mention Yamato's unfinished sentence being 'cancelled out' by Sakura's confession, almost as if Kishimoto is changing his mind on a dime as he writes the manga. If that's your personal belief regarding Kishimoto's style, that's fine, but I haven't seen any real evidence as of yet that the romantic subplot is prone to it. In fact, even recent events, like the Mina/Kushi similarities that people are mentioning up above, seem to support the idea that Kishi's endgame pairing probably hasn't changed from 297.
Also, keep in mind that the nature of Yamato's line as an unfinished sentence. It's not as if Kishi made a blatant hint, at the time, that Sakura was in love with Naruto. Instead, it's a neutral observer pointing out her feelings. It casts enough doubt that it can't be taken as instant proof of her feelings, but at the same time, it comes across as extremely obvious what Kishi is pointing at. The overall context of the scene is fairly straight-forward, despite the ambiguity. On top of that, being a scene in a work of fiction, it can't be tossed aside as a 'Oh, he just doesn't know what he's talking about' moment. Unless we see evidence that Kishi is really working on a chapter-by-chapter basis, without a real idea of what he wants to do in the end, the fact remains that this scene was inserted for a reason.
I'm not saying that Sakura's confession was necessarily true, but I think there are enough reasons to say that Kishimoto did not "make his official thoughts clear on the matter".
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That's kind of what keeps my belief in NS going... Especially the way Kushina explained how she HAAAATED Minato to Naruto when they met. It reminded me so much of a certain pink haired ninja. o:
