Anytime you have a line like "something familiar" in a movie, you automatically wonder, what's this person's connection... In this case, what's Luke's connection to this place. You don't just put something like that in a movie without it adding to something, and that something should have been in the prequels. That IMO was the point of the prequels... To answer all the questions we had... Well, that question was NEVER answered. Sorry, Lucas screwed up. No other explanation. Or he's just a jerk... That could be it too.