Characterization of $Q$-complex tori via endomorphisms -- an addendum to "Int-amplified endomorphisms of compact Kähler spaces''

In this short note, we consider a normal compact Kähler klt space $X$ whose canonical divisor $K_X$ is pseudo-effective, and give a dynamical criterion for $X$ to be a $Q$-complex torus. We show that, if such $X$ admits an int-amplified endomorphism, then $X$ is a $Q$-complex torus. As an application, we prove that, if a simply connected compact Kähler (smooth) threefold admits an int-amplified endomorphism, then it is (projective and) rationally connected.