This one is just an idea, and not sure how I feel about it.
Seems like it’d be a little cleaner from a continuity perspective for Luke to have a different response when Ben tells him his father was a Jedi who fought in the war. Luke repeats the lie from Owen about him just being a navigator on a freighter.
Instead, I’d think Luke ought to react with something like “wow my dad WAS that Skywalker.”
So what about his first line of the scene being “No, my father wasn’t the one who fought in the war, he was a navigator on a spice freighter.”