Lithe, he said level 6 Jeuno fame. Doing this quest in Selbina raises both San d'Oria and Bastok fame at the same time, both of which are components for Jeuno fame (so while it won't raise your San d'Oria fame as high, because it's counting both nations, it counts for more in Jeuno).
And maybe moss does raise it faster than Millioncorn or cabbages, not sure.
Also, it might matter what your Windurst fame is, how much it will affect your Jeuno fame. If I remember correctly, Jeuno fame is based on your highest nation fame plus your lowest nation fame, so if you haven't done any quests in Windy, the extra Bastok fame isn't going to help you.