  A new modification of spherically symmetric models inspired by loop quantum
gravity has recently been introduced by Benitez, Gambini and Pullin, who
claimed that it preserves general covariance. This claim is shown here to be
incorrect, based on methods of effective line elements. The same methods imply
that the only novel physical effect introduced by the modification is the
presence of time-reversal hypersurfaces between classical space-time regions.
