Kevin B. Smith
Lake Forest Park
The luxury good means you add 1 luxury good each turn to the luxury good card.This aligns with the answer here, from someone who says they asked Bernd directly.
That answer makes sense if you're familiar with the original board game, but I don't know how anyone could guess it from just the card game rules.
Hopefully the rulebook will be updated to include this, although I would actually prefer that a second edition use different (more explicit) iconology to distinguish "income you get every round" from "production you have available when you feed" from "production you have available when you build".