That's true. But it's not excluding display stuff.
It's along the lines of some product having multiple features, and some marketing point only talking about the advantages of the first feature. People would expect further marketing points to address the other features, and/or not even realise they'd not seen the other ("assumed to be present") features mentioned later on.
How many product landing pages talk about what you cannot do with the product or what it doesn't include? That'd be a very strange landing page for a product...
However, do you really think the marketing team didn't get together and recognize the major limitation of not having a display, and carefully craft the marketing so as to minimize that?
Probably a bunch of people wished it was Google Glass 2.0 because it'd make the marketing people jobs easier/more interesting, but I don't think they'd craft the message to trick people, it'll impact the amount of returns and they'll probably lose more handling that than people not buying it because it doesn't have a screen.