I think that's actually the issue, though. A backstory is usually in the background -- something to help the designers (or actors, author, etc.) frame what they're doing. It's generally not part of marketing materials.
With the limited information we have right now, the backstory feels divorced from the attraction (i.e. if the backstory didn't exist it wouldn't have any material impact on the ride itself), and thus feels superfluous. That's not necessarily out of the ordinary for a backstory, but it becomes an issue here because Disney promoted it.
That could certainly change once the attraction opens and we see the whole thing, though, so there is a giant caveat on all of this.
I also don't think it's a major problem or one that should have any impact on a person's enjoyment of the attraction itself -- it just feels like a bit of a misfire on Disney's part. It's also why the Mama Odie's hot sauce bottle was so confusing.