Island of Naath

So this is the second episode where the island of Naath has been mentioned by name. First from Grey-Worm before the sex scene with Missandei, and again this week when Davos asks where her accent is from. Now that efficiency has arrived, does it make sense to read into this? It seems like unnecessary information to put into banter where Davos could just have said "nice fro" and we would have the same scene more or less. Is this "previously on"-fodder for next season where Naath may come into play in some way, or is it just shit stuffing for the cardboard character Missandei?

Feel free to call me names if this is stupid af