You would be confidently wrong. They are artificially de-greened with ethylene. In Brazil it doesn’t get cold enough for natural de-greening. Also, having tasted both natural green and de-greened (and naturally de-greened) oranges. Their outer color has no correlation whatsoever to the taste.
Size is only a proof of logistics. Not tech. Physics don’t change fundamentally between 6 meters and 120 meters. You learn a lot from scale modeling without the added costs. Starship’s real challenge is actually the logistics necessary to fulfill the desired specifications and experimenting with engineering to reach the scale. The most innovative aspect of Starship would be orbital refueling, and they aren’t there since the thing hasn’t reached orbit yet. SpaceX problem right now is insisting on high turnover engineering, which doesn’t work at scale without heavy costs, because it is a logistic problem, not a engineering problem.