How do you know specs don't go backwards? How you personally been involved in the creation procces of a console before?
It makes perfect sense to me that it's possible that they overshot their early dev builds, perhaps using the specs of early builds would have just been to expensive to use for the final console for a pricepoint that Nintendo may be aiming for.
As for your "I don't get why it's not to be taken as legit", well if this was professional legit interview, the THQ employee would have been named as I have previously stated.
We've had numerous reports since E3 that there have been multiple dev kits and each dev kit saw an increase of power from the last.
If what you were saying was true, they would have realised months ago and wouldn't have continued to send out improved dev kits.