Like Blair Witch Project? Maybe like the wampa attack scene…
From an out-of-universe point of view, the clear intention of the scene is to lead into Luke revealing their relationship. Anything other than their mutual birth mother is incoherent. It’s a fantasy film, not found footage.
I agree that was the intent, and within the style of these films (which is extraordinarily simplistic) it probably shouldn’t be taken any other way. But as I’ve complained before, RotJ was the first of the films to degenerate rather than continue or enhance, and it needn’t be held to such a simplistic standard for fanedits or future references.
I get the found footage gist. But it could be sleight of hand, rather than bald lead-up. A bait-and switch of “Hey, let’s discuss our parents” and “well, that’s a nice story but, um, by the way, actually you’re adopted and we’re siblings.”
Sorry for all the edits.