This is a lie. SEAS did confirm that all of the slides collectively known as the PowerPoint was in fact a real and from a internal company presentation. If you need a source:
The only thing SEAS did not back up was if the information was current, unchanged, or the context of that information was in relation to actual attractions being added. Therefore, the information may be old and outdated, it may have changed many times, or any piece of (or the whole presentation) may have been a internal joke or may have been designed to be leaked and contain false information altogether. To simply state that it is not an official or internal document is entirely misleading and incorrect.
I feel bad for all the passerby's who have a hard time trying to follow along passively and are lost in the muck.