Seriously. The projection was over a year. No sane company would actually make their entire projection on day 1 of the year and then sell them through:
a) You'd need a bigger warehouse to hold the pending units headed for the retail channel. This is a waste of money to hold every single unit you're ever going to sell at once, because your storage overhead would be insane.
b) You'd be ramping up production really fast and then just sitting on factories you can't use for the rest of the year
c) It's really, really stupid if your forecast falls short.
They forecasted Y units. They had X units ready to go. If the sales trend was indicating Y was actually going to be reached, production would have been started before the already made units sold through to consumers. If the trend was undershooting, then they slow production or stop it. It is not a lie to not have all your units ready to go when forecasting a sales number, nor do you have proof that Nintendo could not physically meet the forecasted number over 365 days of production.