Zero sequence component in unbalanced faults rotation
The first highlight says they are still rotating phasors, and the second says they have no phase rotation. That means they are phasors and all have the same magnitude and phase. Their phases are the same so they still rotate, but they have no phase rotation between them, i.e. \$\phi_1-\phi_2=\phi_2-\phi_3=\phi_3-\phi_1=0\$. Equal magnitudes, same angles. The picture b) from the first book agrees with the formula 6.109c from the second.