  In a recent Rapid Communication [A. Stan, Phys. Rev. B \textbf{93}, 041103(R)
(2016)], the reliability of the Keldysh--Kadanoff--Baym equations (KBE) using
correlated selfenergy approximations applied to linear and nonlinear response
has been questioned. In particular, the existence of a universal attractor has
been predicted that would drive the dynamics of any correlated system towards
an unphysical homogeneous density distribution regardless of the system type,
the interaction and the many-body approximation. Moreover, it was conjectured
that even the mean-field dynamics would be damped. Here, by performing accurate
solutions of the KBE for situations studied in that paper, we prove these
claims wrong being caused by numerical inaccuracies.
