It mentions it gives +2 power pool and when I google power pool it takes me to power source which has stuff like arcane and nature under it. It works for melee people though (like guile users). I'm guessing it's working as designed because +2 spells at every level would be too much fun but couldn't hurt to check. 

If you mouseover the in game tooltip for power pool it specifies those classes that get the bonus. Spellcasters aren't amongst them sadly.