Here's the interview with Johnson. He says "Kylo believes it to be true" that Rey is a nobody, so I guess that doesn't necessarily make it true.
Johnson also says he was aiming for the opposite of an "I am your father" moment: https://ew.com/movies/2017/12/16/the-last-jedi-spoiler-rey-parents/2/
And here's Simon Pegg saying J.J. had something different in mind: https://www.gizmodo.com.au/2018/04/...plan-for-reys-parentage-before-the-last-jedi/
Well they can turn that lie either way....
No one knew if Vader was telling the truth at the end of ESB....GL put in the whole Yoda scene in ROTJ because people needed to hear from a trusted figure that Vader was truthful.....
The opposite could be done here....Luke appears to tell Rey her real parentage “Luke’s Daughter” ??? Or something else and everything he was doing was to protect her from making the same mistakes he made with Kylo.
I've been saying this since TLJ first hit theaters. Kylo's line is untrue, whether deliberately or not. And it is a twist on expectation based on Vader's line in ESB.