Kishi also said at the beginning of part 2 that he would bring more romance in part 2 and that one character's feelings would be returned. He also said that NaruSaku was a mislead while at the same time had no interest writing about NH romance, why would you need a mislead if you have no intention to write about the intented pairing itself ? Seriously stop taking Kishi's interviews so seriously the man is a confirmed liar who always comes up with new excuses that contradicts earlier excuses.
The only thing Kishi confirmed is that he's full of kitten and that he doesn't know how to justify his poor "planned" ending.
I think that the part he said he began considering romance for the protagonist "during the beginning of part 2" is true.
But when he said that this romance was NH he is actually lying because if you guys look at it, early part 2 is full of NS moments, so I think NS was gameplan until he changed his mind due to external bias