"Not real" usually means that you're sitting there waiting to block something in a situation where you could actually avoid it.
Usually avoiding the incoming offense means:
-Waking up
-Backdashing
-Interupting with a normal, a special, or with armor
-Walking out
-Tech rolling off the ground
etc.
So it usually describes a situation in which the person isn't taking their options to get out, because they don't know that they can