At the end of the day these guys have to sell their products.
In their executive meetings they are probably shitting all over the Wii U, but that is a product that is still being sold and has games coming out for it for at least one more year, so damage control is, in reality, the only thing they can do.
Saying stuff like "Our Wii U is a big failure, and we are planning to release the NX next year" will decrease even more the sales of the Wii U.
I'm not trying to defend them, but people need to understand that Nintendo is a business (mostly talking about Reggie and Iwata here), and they have to do whatever it takes to make their product don't look as bad as it is.
A better solution would simple be not say anything on the matter, keep interviews as low as possible and when you have to do them, think very carefully what you are going to say.
Nintendo and PC gamer