The T/F divide appears to make very little difference at all. Even if one "dislikes" this data for suggesting a "superiority" of N, it is quite edifying to note that F's of both "flavors" score very high when they're INFx. Notice that gifted INFPs are very common (over 10%!). Never assume that an INFP is "stupid" due to the "FP"!!! The opposite is the case, in my experience.
It is interesting to see that in the E part of the picture, it's totally dominated by Ne, which isn't entirely unexpected. Even though Ne doms are nominally extroverted, they can be fairly introverted by normal social standards, which makes them "nerds", too.
It is also interesting to note that ESxJ comprises almost 30% of the "normal" population, but are about equivalent to the percentages of the other xSxx "gifted" population. It is possible to interpret this as saying "ESxJ" is the "stupidest" of the types, but another way to interpret it is that people tend to type based on their expected roles in society rather than their real type. If we regard ESxJ as representing "expected roles", then this isn't a sign of the gifted percentages being low, but rather the MBTI test getting too many ESTJ and ESFJ results due to peoples' self-perception being based on society's expectations.