I haven't grown enough indica-dom or real sativas to make a proper comparison but I do agree with that quote, light feeders in general. They tend to take their time too so in the end it doesn't necessarily mean they use less nutes in total. By the time an indica is almost done a sativa is relatively heavily feeding and may need a boost to make up for the depleted medium. So I guess it depends on your point of view. There are sativas that need more than indicas and the other way around so the best way is still just to read your plants regardless of what it is.
I'm not much of a soil grower, I need a blumat tensiometer to prevent overwatering, but I wouldn't add more nutes than the other plants with the idea to beef up buds of a real sativa as long as the plant is overall looking healthy. At most I would do that a second run to see if it was genetics or a lack of nutrients. It looks great and if there are enough nutrients in the medium it will find what it need. "Enough" being a wide range between too little and too much in which the results are more or less the same.