[Returning to their galaxy is the only goal in the end, even if it means that their memories of this place might not stick with them. He's heard reports of it and Hux is honestly inclined to believe it. It's not like Kenobi or Anakin Skywalker can change the future now, because then everyone in their future will be affected in some way.

They must return, even if he and Ren won't remember their time together.]

...Yes, although I suppose there's no use in worrying about such things at the moment. [Hux tries to be completely neutral as he talks, but there's a small chill in the air now. He almost seems... saddened? What.] Focus on our current problems and don't be sidetracked by the unknown possibilities.