To know the air date of a Direct, it's not the same thing as to know what's the content in this presentation.
There are a lot of insider sources that you can use to know the exact air date of a Direct. For example, a third party partner featured in the video, that will plan to start its marketing campaign or pre-orders just after the Direct, and even retailers. Tthird party partners featured in the video, and even some retailers, can know the exact date without working in Nintendo.
Plus, these type of video predictions, are created to generate clicks. So it's important to speculate about every dreamed or rumored game by your audience.
