Here’s the context of that quote from British GQ, December 2017:

Driver is on a roll now, discussing what excites him: character and narrative and cinematic influences. The original Star Wars was an homage to Akira Kurosawa’s 1958 film The Hidden Fortress, he says, and the link lives on in the new trilogy, in which concealed identities drive the narrative. Then he lets it slip.



“You have, also, the hidden identity of this princess who’s hiding who she really is so she can survive and Kylo Ren and her hiding behind these artifices,” Driver says, apparently dropping a massive revelation about Rey’s royal origins.

In the film, Princess Yuki Akizuki is forced to keep her identity secret and she poses as a mute. I don’t think he was referring to Rey. The writer just assumed he was.

So Adam was comparing Kylo to Princess Yuki.