So at that point the game more or less could be whatever it wanted without taking too big a hit. At the same time, Square desperately needs a good game to come out of japan and be a smashing hit. And that's why this is a bad idea, anything to delay releasing basically the only title anyone was remotely hyped up for would be bad mojo. But that's not idiocy, it's just getting carried away.
The bolded part is basically what I was trying to say, yes. It happens, and it's not like Nomura was pushing really that heavily for it. He got a little obsessed in something recently, and everyone else talked him out of it. I wouldn't be surprised if in the interview, he looks back at himself and laughs because he himself admits it was silly.
You also hit the whole "in January, we seriously thought the game was cancelled, because this many years and we know nothing" point I was trying to say. I'll just reference what yo said, but add in all we did know about FFv13 at the time was, from 2 "Oooh look at the pretty!" trailers was "The main character is a prince named Noctis, he can summon swords!" and "This is an ARPG." This is about as much as we knew of FF13 when it's first trailer was released, which was just "Meet the new main, she's a female Cloud with pink hair, and she has TIME POWERS!"
I think people are looking at me as trying to defend Nomura's actions as being good. I'm not; I'm highlighting why they aren't "IotD" Material, more just "Ok, that's just silly." Getting carried away happens, it happened to Nomura, everyone else in Square-enix talked him out of it, seemingly fairly fast at that, they moved on. Also worth noting it's IGN stating "he had full intention of doing that!", and it's not an actual quote by Nomura, so they could be blowing it out of proportion, but whatever, that's minor.
Also, this article is apparently made in June, shortly after the E3 Trailer was made...dunno if that's relevant, but just pointing that out.
Tangentially, the KH3 thing? Sounds like typical Square-enix being Square-enix with their "hey guys, let's announce a game that isn't coming out for a while yet, because hype!" I mean, really, the FFv13 -> FF15 thing was big enough for E3 alone. At least Nomura had the decency to admit it was probably too early, though really don't know whose decision that is.