Dear Halaliel...
Interesting statement. Perhaps your RM is saying that what some people perceive as spirit guides is really, in fact, just their own higher self or their own intuition. But that wouldn't discount, in my opinion, the existence of spirit guides or Reiki guides as entities other than ourselves. Sometimes trying to figure out the difference can be challenging...but then again it all leads to our own higher awareness and growth.
I'll be interested in the thoughts of others.
Peace and Light,
Lesley