I just said it wasn't unusual in my experience. I haven't ordered a special edition of a game in a few years, but I remember press release graphics of everything that comes in an edition, even if some of that stuff is not exclusive to that edition.

Not one of the graphics I mentioned, but here's an example of what I mean: https://support.square-enix-games.com/s/article/000001061

I just don't think that any confusion on that page is as intentional as you believe it is. The same Steam page indicates that the DLC is included in the base game.