The authors interpretation of a genius is not intelligence, but creativity. Its different from the conventional definition of genius. In the common definition for genius, IQ is the most valuable asset. The author says that the definition of a genius is wrong, and that a genius lies in creativity and innovation, not IQ.
Shared strategies of genius are things that only true geniuses do. For example, making something come alive and thinking outside the box, rather than looking for only one solution.