Failed to compile: LimitedAdmin.cs(314,42): error CS0246: The type or namespace name `NPCPlayerApex' could not be found. Are you missing an assembly reference?

Someone that know for sure should answer but I did find this -

https://umod.org/community/npc-target/16452-animals-and-npcs-still-kill-each-other

- you should be able to just remove/comment out the two references to 'OnNpcPlayerTarget' from the plugin?
It does compile and run afterwards but not sure about this.

Yep, I can confirm. If you remove the lines it was compile afterwards, but of course you are missing the function then.