Is that using NWNX or similar?
Sorry Proleric, missed this question. No, it does not use NWNX. It turns off the CR and immunities with the ini and has a radial menu examine function which is scripted. It uses lore like checks to determine what you learn. You get the feedback via SendMessageToPC not the creature description window although it does open that up for you. Depending on how well you roll you get more info, creature type, relative challenge, immunities and special abilities.
I suspect you could modify the description with that info before opening the examine window and then clear it later somehow. Have not looked into that, The sendmessage way means it only goes to the PC doing the examine, whereas changing the description could be seen by others.
edit: forgot to mention that the system sets the name and built in description to something generic on spawn. It then restores these to their original values when passing the lore check. So if you just look using the default examine it does not show much.