The demo they're describing was released after the initial set of demos and made by a third party. I don't think the bar for disclosure is as high when you say "look what some content creators were able to do with this".
At worst a lie of omission/misleading language, though. Someone eager to see what Sora is capable of will naturally assume that the whole thing was generated by Sora, but someone already skeptical or familiar with the capabilities of modern AI will look at it and go 'ah, this was post-processed'.
I interpreted that comment as sarcasm; if not, then the spirit of the communication seems to be another euphemism added to the list of what used to be called deceptive advertisements, commonly known as falsehoods.
The crazy thing to me is that they given the videos they originally showed (100% Sora?) they didn't need to falsely advertise. What it can do is incredibly impressive without dressing it up.
(https://news.ycombinator.com/item?id=40162794)