A text can have multiple thematic interpretations. Nowhere is it stated in the text that Rey has feelings of unworthiness (other than, arguably, when it comes to owning Luke’s lightsaber). It’s a perfectly valid interpretation, but it isn’t hardwired into her character arc. (And, even if it was, there’s no reason it couldn’t be changed in a fanedit like this.) We’re all going to read different things into characters and their journeys, and that’s fine.