Don't think too hard Iggy. Of course maybe the authors just reversed the axes on that dang curve.
Are you really saying that you do not understand the difference between group averages and individuals within a group?
The small part of "The Bell Curve" that referenced race (and I am presuming that is what your pictures referred to) was very clear that the differences within groups were larger than the differences between groups.
Your pictures speak to the presumed intelligence of two individuals and nothing about the averages for their racial group.