That seems to address a subtlety about the layers of the retina, unrelated to the (bigger) problem of the optic nerve unnecessarily punching through the retina, leaving a blind spot that can't pick up light.

This feature/bug is absent in cephalids with no corresponding downside.

The human optic nerve structure makes more sense as being an artifact of path dependence and the "local improvement constraint" than it being (more) globally optimal in design space.